25515897 has 8 divisors (see below), whose sum is σ = 37114080. Its totient is φ = 15464160.

The previous prime is 25515887. The next prime is 25515923. The reversal of 25515897 is 79851552.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 25515897 - 2⁷ = 25515769 is a prime.

It is not an unprimeable number, because it can be changed into a prime (25515887) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 386572 + ... + 386637.

It is an arithmetic number, because the mean of its divisors is an integer number (4639260).

Almost surely, 2^25515897 is an apocalyptic number.

It is an amenable number.

25515897 is a deficient number, since it is larger than the sum of its proper divisors (11598183).

25515897 is a wasteful number, since it uses less digits than its factorization.

25515897 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 773223.

The product of its digits is 126000, while the sum is 42.

The square root of 25515897 is about 5051.3262614882. The cubic root of 25515897 is about 294.3994177842.

It can be divided in two parts, 255158 and 97, that added together give a triangular number (255255 = T₇₁₄).

The spelling of 25515897 in words is "twenty-five million, five hundred fifteen thousand, eight hundred ninety-seven".