25315431 has 8 divisors (see below), whose sum is σ = 35739504. Its totient is φ = 15884160.

The previous prime is 25315421. The next prime is 25315439. The reversal of 25315431 is 13451352.

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

It is not a de Polignac number, because 25315431 - 2¹⁰ = 25314407 is a prime.

It is a super-2 number, since 2×25315431² = 1281742093431522, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (25315439) 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, 248140 + ... + 248241.

It is an arithmetic number, because the mean of its divisors is an integer number (4467438).

Almost surely, 2^25315431 is an apocalyptic number.

25315431 is a deficient number, since it is larger than the sum of its proper divisors (10424073).

25315431 is a wasteful number, since it uses less digits than its factorization.

25315431 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 496401.

The product of its digits is 1800, while the sum is 24.

The square root of 25315431 is about 5031.4442260647. Note that the first 3 decimals coincide. The cubic root of 25315431 is about 293.6264054671.

Adding to 25315431 its reverse (13451352), we get a palindrome (38766783).

The spelling of 25315431 in words is "twenty-five million, three hundred fifteen thousand, four hundred thirty-one".