91163925 has 36 divisors (see below), whose sum is σ = 163843680. Its totient is φ = 48454560.

The previous prime is 91163923. The next prime is 91163959. The reversal of 91163925 is 52936119.

91163925 is a `hidden beast` number, since 9 + 11 + 639 + 2 + 5 = 666.

It is not a de Polignac number, because 91163925 - 2¹ = 91163923 is a prime.

It is a super-2 number, since 2×91163925² = 16621722442811250, which contains 22 as substring.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 91163925.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (91163923) by changing a digit.

It is a polite number, since it can be written in 35 ways as a sum of consecutive naturals, for example, 93792 + ... + 94758.

Almost surely, 2^91163925 is an apocalyptic number.

It is an amenable number.

91163925 is a deficient number, since it is larger than the sum of its proper divisors (72679755).

91163925 is a wasteful number, since it uses less digits than its factorization.

91163925 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1402 (or 1394 counting only the distinct ones).

The product of its digits is 14580, while the sum is 36.

The square root of 91163925 is about 9547.9801528910. The cubic root of 91163925 is about 450.0640649529.

It can be divided in two parts, 9116 and 3925, that added together give a triangular number (13041 = T₁₆₁).

The spelling of 91163925 in words is "ninety-one million, one hundred sixty-three thousand, nine hundred twenty-five".