91155725 has 6 divisors (see below), whose sum is σ = 113033130. Its totient is φ = 72924560.

The previous prime is 91155703. The next prime is 91155733. The reversal of 91155725 is 52755119.

It can be written as a sum of positive squares in 3 ways, for example, as 13380964 + 77774761 = 3658^2 + 8819^2 .

It is a de Polignac number, because none of the positive numbers 2^k-91155725 is a prime.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 1823090 + ... + 1823139.

It is an arithmetic number, because the mean of its divisors is an integer number (18838855).

Almost surely, 2^91155725 is an apocalyptic number.

It is an amenable number.

91155725 is a deficient number, since it is larger than the sum of its proper divisors (21877405).

91155725 is a wasteful number, since it uses less digits than its factorization.

91155725 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3646239 (or 3646234 counting only the distinct ones).

The product of its digits is 15750, while the sum is 35.

The square root of 91155725 is about 9547.5507330414. The cubic root of 91155725 is about 450.0505704484.

The spelling of 91155725 in words is "ninety-one million, one hundred fifty-five thousand, seven hundred twenty-five".