25280031 has 24 divisors (see below), whose sum is σ = 40055040. Its totient is φ = 14134512.

The previous prime is 25280009. The next prime is 25280033. The reversal of 25280031 is 13008252.

It is not a de Polignac number, because 25280031 - 2⁵ = 25279999 is a prime.

It is a super-2 number, since 2×25280031² = 1278159934721922, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (21).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (25280033) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 5080 + ... + 8738.

It is an arithmetic number, because the mean of its divisors is an integer number (1668960).

Almost surely, 2^25280031 is an apocalyptic number.

25280031 is a gapful number since it is divisible by the number (21) formed by its first and last digit.

25280031 is a deficient number, since it is larger than the sum of its proper divisors (14775009).

25280031 is a wasteful number, since it uses less digits than its factorization.

25280031 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3723 (or 3716 counting only the distinct ones).

The product of its (nonzero) digits is 480, while the sum is 21.

The square root of 25280031 is about 5027.9251187741. The cubic root of 25280031 is about 293.4894768150.

Adding to 25280031 its reverse (13008252), we get a palindrome (38288283).

The spelling of 25280031 in words is "twenty-five million, two hundred eighty thousand, thirty-one".