1025602813 has 4 divisors (see below), whose sum is σ = 1028160828. Its totient is φ = 1023044800.

The previous prime is 1025602801. The next prime is 1025602849. The reversal of 1025602813 is 3182065201.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 3182065201 = 7 ⋅454580743.

It can be written as a sum of positive squares in 2 ways, for example, as 773841124 + 251761689 = 27818^2 + 15867^2 .

It is a cyclic number.

It is not a de Polignac number, because 1025602813 - 2¹³ = 1025594621 is a prime.

It is a super-2 number, since 2×1025602813² = 2103722260067025938, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1025602883) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1278406 + ... + 1279207.

It is an arithmetic number, because the mean of its divisors is an integer number (257040207).

Almost surely, 2^1025602813 is an apocalyptic number.

It is an amenable number.

1025602813 is a deficient number, since it is larger than the sum of its proper divisors (2558015).

1025602813 is an equidigital number, since it uses as much as digits as its factorization.

1025602813 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2558014.

The product of its (nonzero) digits is 2880, while the sum is 28.

The square root of 1025602813 is about 32025.0341607936. The cubic root of 1025602813 is about 1008.4624558335.

The spelling of 1025602813 in words is "one billion, twenty-five million, six hundred two thousand, eight hundred thirteen".