25505531 has 8 divisors (see below), whose sum is σ = 25952400. Its totient is φ = 25062400.

The previous prime is 25505509. The next prime is 25505539. The reversal of 25505531 is 13550552.

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

It is not a de Polignac number, because 25505531 - 2¹⁴ = 25489147 is a prime.

It is a super-2 number, since 2×25505531² = 1301064223183922, 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 25505531.

It is not an unprimeable number, because it can be changed into a prime (25505539) 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, 15131 + ... + 16731.

It is an arithmetic number, because the mean of its divisors is an integer number (3244050).

Almost surely, 2^25505531 is an apocalyptic number.

25505531 is a deficient number, since it is larger than the sum of its proper divisors (446869).

25505531 is a wasteful number, since it uses less digits than its factorization.

25505531 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1869.

The product of its (nonzero) digits is 3750, while the sum is 26.

The square root of 25505531 is about 5050.3000900937. The cubic root of 25505531 is about 294.3595451547.

The spelling of 25505531 in words is "twenty-five million, five hundred five thousand, five hundred thirty-one".