1025638897 has 4 divisors (see below), whose sum is σ = 1025815536. Its totient is φ = 1025462260.

The previous prime is 1025638843. The next prime is 1025638907. The reversal of 1025638897 is 7988365201.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 1025638897 - 2¹⁹ = 1025114609 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 1025638897.

It is not an unprimeable number, because it can be changed into a prime (1025638837) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 79303 + ... + 91324.

It is an arithmetic number, because the mean of its divisors is an integer number (256453884).

Almost surely, 2^1025638897 is an apocalyptic number.

It is an amenable number.

1025638897 is a deficient number, since it is larger than the sum of its proper divisors (176639).

1025638897 is an equidigital number, since it uses as much as digits as its factorization.

1025638897 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 176638.

The product of its (nonzero) digits is 725760, while the sum is 49.

The square root of 1025638897 is about 32025.5975276028. The cubic root of 1025638897 is about 1008.4742826772.

The spelling of 1025638897 in words is "one billion, twenty-five million, six hundred thirty-eight thousand, eight hundred ninety-seven".