25531161 has 16 divisors (see below), whose sum is σ = 36246528. Its totient is φ = 15929600.

The previous prime is 25531159. The next prime is 25531169. The reversal of 25531161 is 16113552.

It is a cyclic number.

It is not a de Polignac number, because 25531161 - 2¹ = 25531159 is a prime.

It is not an unprimeable number, because it can be changed into a prime (25531169) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 8431 + ... + 11051.

It is an arithmetic number, because the mean of its divisors is an integer number (2265408).

Almost surely, 2^25531161 is an apocalyptic number.

It is an amenable number.

25531161 is a deficient number, since it is larger than the sum of its proper divisors (10715367).

25531161 is a wasteful number, since it uses less digits than its factorization.

25531161 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2832.

The product of its digits is 900, while the sum is 24.

The square root of 25531161 is about 5052.8369259259. The cubic root of 25531161 is about 294.4581108275.

The spelling of 25531161 in words is "twenty-five million, five hundred thirty-one thousand, one hundred sixty-one".