1025453993 has 4 divisors (see below), whose sum is σ = 1050465108. Its totient is φ = 1000442880.

The previous prime is 1025453971. The next prime is 1025454029. The reversal of 1025453993 is 3993545201.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 3993545201 = 4127 ⋅967663.

It can be written as a sum of positive squares in 2 ways, for example, as 483868009 + 541585984 = 21997^2 + 23272^2 .

It is a cyclic number.

It is not a de Polignac number, because 1025453993 - 2²⁴ = 1008676777 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (41), and also a Moran number because the ratio is a prime number: 25011073 = 1025453993 / (1 + 0 + 2 + 5 + 4 + 5 + 3 + 9 + 9 + 3).

It is a Duffinian number.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 1025453993.

It is not an unprimeable number, because it can be changed into a prime (1025453903) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 12505496 + ... + 12505577.

It is an arithmetic number, because the mean of its divisors is an integer number (262616277).

Almost surely, 2^1025453993 is an apocalyptic number.

It is an amenable number.

1025453993 is a deficient number, since it is larger than the sum of its proper divisors (25011115).

1025453993 is an equidigital number, since it uses as much as digits as its factorization.

1025453993 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 25011114.

The product of its (nonzero) digits is 145800, while the sum is 41.

The square root of 1025453993 is about 32022.7105817106. The cubic root of 1025453993 is about 1008.4136758574.

The spelling of 1025453993 in words is "one billion, twenty-five million, four hundred fifty-three thousand, nine hundred ninety-three".