25049431 has 4 divisors (see below), whose sum is σ = 27326664. Its totient is φ = 22772200.

The previous prime is 25049411. The next prime is 25049471. The reversal of 25049431 is 13494052.

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

It is a de Polignac number, because none of the positive numbers 2^k-25049431 is a prime.

It is a super-2 number, since 2×25049431² = 1254947986847522, 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 25049431.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (25049411) 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, 1138600 + ... + 1138621.

It is an arithmetic number, because the mean of its divisors is an integer number (6831666).

Almost surely, 2^25049431 is an apocalyptic number.

25049431 is a deficient number, since it is larger than the sum of its proper divisors (2277233).

25049431 is a wasteful number, since it uses less digits than its factorization.

25049431 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2277232.

The product of its (nonzero) digits is 4320, while the sum is 28.

The square root of 25049431 is about 5004.9406589889. The cubic root of 25049431 is about 292.5943631063.

It can be divided in two parts, 2504 and 9431, that added together give a triangular number (11935 = T₁₅₄).

The spelling of 25049431 in words is "twenty-five million, forty-nine thousand, four hundred thirty-one".