25623431 has 4 divisors (see below), whose sum is σ = 25639152. Its totient is φ = 25607712.

The previous prime is 25623407. The next prime is 25623461. The reversal of 25623431 is 13432652.

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 25623431 - 2²² = 21429127 is a prime.

It is a super-2 number, since 2×25623431² = 1313120432423522, which contains 22 as substring.

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 25623431.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (25623461) 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, 5090 + ... + 8783.

It is an arithmetic number, because the mean of its divisors is an integer number (6409788).

Almost surely, 2^25623431 is an apocalyptic number.

25623431 is a deficient number, since it is larger than the sum of its proper divisors (15721).

25623431 is a wasteful number, since it uses less digits than its factorization.

25623431 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 15720.

The product of its digits is 4320, while the sum is 26.

The square root of 25623431 is about 5061.9592056831. The cubic root of 25623431 is about 294.8124097035.

The spelling of 25623431 in words is "twenty-five million, six hundred twenty-three thousand, four hundred thirty-one".