91156136 has 24 divisors (see below), whose sum is σ = 172781310. Its totient is φ = 45086400.

The previous prime is 91156111. The next prime is 91156147. The reversal of 91156136 is 63165119.

It is a happy number.

It can be written as a sum of positive squares in 3 ways, for example, as 90364036 + 792100 = 9506^2 + 890^2 .

It is a super-2 number, since 2×91156136² = 16618882260900992, which contains 22 as substring.

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, 81050 + ... + 82166.

Almost surely, 2^91156136 is an apocalyptic number.

It is an amenable number.

91156136 is a deficient number, since it is larger than the sum of its proper divisors (81625174).

91156136 is a wasteful number, since it uses less digits than its factorization.

91156136 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1325 (or 1220 counting only the distinct ones).

The product of its digits is 4860, while the sum is 32.

The square root of 91156136 is about 9547.5722568620. The cubic root of 91156136 is about 450.0512468386.

It can be divided in two parts, 9115 and 6136, that added together give a palindrome (15251).

The spelling of 91156136 in words is "ninety-one million, one hundred fifty-six thousand, one hundred thirty-six".