25921161 has 64 divisors (see below), whose sum is σ = 47001600. Its totient is φ = 13799808.

The previous prime is 25921151. The next prime is 25921163. The reversal of 25921161 is 16112952.

25921161 is a `hidden beast` number, since 2 + 592 + 11 + 61 = 666.

It is not a de Polignac number, because 25921161 - 2⁶ = 25921097 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (25921163) 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 63 ways as a sum of consecutive naturals, for example, 291205 + ... + 291293.

It is an arithmetic number, because the mean of its divisors is an integer number (734400).

Almost surely, 2^25921161 is an apocalyptic number.

25921161 is a gapful number since it is divisible by the number (21) formed by its first and last digit.

It is an amenable number.

25921161 is a deficient number, since it is larger than the sum of its proper divisors (21080439).

25921161 is a wasteful number, since it uses less digits than its factorization.

25921161 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 195 (or 189 counting only the distinct ones).

The product of its digits is 1080, while the sum is 27.

The square root of 25921161 is about 5091.2828442348. The cubic root of 25921161 is about 295.9498674837.

It can be divided in two parts, 25921 and 161, that multiplied together give a cube (4173281 = 161³).

The spelling of 25921161 in words is "twenty-five million, nine hundred twenty-one thousand, one hundred sixty-one".