25155531 has 6 divisors (see below), whose sum is σ = 36335780. Its totient is φ = 16770348.

The previous prime is 25155527. The next prime is 25155547. The reversal of 25155531 is 13555152.

It is not a de Polignac number, because 25155531 - 2² = 25155527 is a prime.

It is a super-2 number, since 2×25155531² = 1265601479783922, which contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 25155495 and 25155504.

It is not an unprimeable number, because it can be changed into a prime (25155511) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 1397521 + ... + 1397538.

Almost surely, 2^25155531 is an apocalyptic number.

25155531 is a deficient number, since it is larger than the sum of its proper divisors (11180249).

25155531 is a wasteful number, since it uses less digits than its factorization.

25155531 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2795065 (or 2795062 counting only the distinct ones).

The product of its digits is 3750, while the sum is 27.

The square root of 25155531 is about 5015.5289850623. The cubic root of 25155531 is about 293.0068879012.

The spelling of 25155531 in words is "twenty-five million, one hundred fifty-five thousand, five hundred thirty-one".