25613431 has 4 divisors (see below), whose sum is σ = 25704864. Its totient is φ = 25522000.

The previous prime is 25613429. The next prime is 25613443. The reversal of 25613431 is 13431652.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 25613431 - 2¹ = 25613429 is a prime.

It is a super-2 number, since 2×25613431² = 1312095695183522, which contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 25613396 and 25613405.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (25613411) 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, 45295 + ... + 45856.

It is an arithmetic number, because the mean of its divisors is an integer number (6426216).

Almost surely, 2^25613431 is an apocalyptic number.

25613431 is a deficient number, since it is larger than the sum of its proper divisors (91433).

25613431 is an equidigital number, since it uses as much as digits as its factorization.

25613431 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 91432.

The product of its digits is 2160, while the sum is 25.

The square root of 25613431 is about 5060.9713494546. The cubic root of 25613431 is about 294.7740527832.

The spelling of 25613431 in words is "twenty-five million, six hundred thirteen thousand, four hundred thirty-one".