25918321 has 12 divisors (see below), whose sum is σ = 30682036. Its totient is φ = 21748320.

The previous prime is 25918307. The next prime is 25918331. The reversal of 25918321 is 12381952.

It can be written as a sum of positive squares in 2 ways, for example, as 6071296 + 19847025 = 2464^2 + 4455^2 .

It is not a de Polignac number, because 25918321 - 2¹¹ = 25916273 is a prime.

It is a hoax number, since the sum of its digits (31) coincides with the sum of the digits of its distinct prime factors.

It is not an unprimeable number, because it can be changed into a prime (25918301) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 6666 + ... + 9811.

Almost surely, 2^25918321 is an apocalyptic number.

It is an amenable number.

25918321 is a deficient number, since it is larger than the sum of its proper divisors (4763715).

25918321 is a wasteful number, since it uses less digits than its factorization.

25918321 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 16512 (or 16501 counting only the distinct ones).

The product of its digits is 4320, while the sum is 31.

The square root of 25918321 is about 5091.0039284998. The cubic root of 25918321 is about 295.9390587044.

The spelling of 25918321 in words is "twenty-five million, nine hundred eighteen thousand, three hundred twenty-one".