25013681 has 32 divisors (see below), whose sum is σ = 33530112. Its totient is φ = 18063360.

The previous prime is 25013629. The next prime is 25013693. The reversal of 25013681 is 18631052.

25013681 = 1205² + 1206² + ... + 1221².

It is not a de Polignac number, because 25013681 - 2⁶ = 25013617 is a prime.

It is a super-2 number, since 2×25013681² = 1251368474339522, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 25013681.

It is not an unprimeable number, because it can be changed into a prime (25013081) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 126875 + ... + 127071.

It is an arithmetic number, because the mean of its divisors is an integer number (1047816).

Almost surely, 2^25013681 is an apocalyptic number.

It is an amenable number.

25013681 is a deficient number, since it is larger than the sum of its proper divisors (8516431).

25013681 is a wasteful number, since it uses less digits than its factorization.

25013681 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 329.

The product of its (nonzero) digits is 1440, while the sum is 26.

The square root of 25013681 is about 5001.3679128814. The cubic root of 25013681 is about 292.4551020769.

It can be divided in two parts, 250 and 13681, that added together give a palindrome (13931).

The spelling of 25013681 in words is "twenty-five million, thirteen thousand, six hundred eighty-one".