91011572 has 12 divisors (see below), whose sum is σ = 159560100. Its totient is φ = 45422976.

The previous prime is 91011559. The next prime is 91011587. The reversal of 91011572 is 27511019.

It can be written as a sum of positive squares in 2 ways, for example, as 31967716 + 59043856 = 5654^2 + 7684^2 .

It is a super-2 number, since 2×91011572² = 16566212475822368, which contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 18197 + ... + 22652.

It is an arithmetic number, because the mean of its divisors is an integer number (13296675).

Almost surely, 2^91011572 is an apocalyptic number.

It is an amenable number.

91011572 is a deficient number, since it is larger than the sum of its proper divisors (68548528).

91011572 is a wasteful number, since it uses less digits than its factorization.

91011572 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 41410 (or 41408 counting only the distinct ones).

The product of its (nonzero) digits is 630, while the sum is 26.

The square root of 91011572 is about 9539.9985324946. The cubic root of 91011572 is about 449.8132097188.

The spelling of 91011572 in words is "ninety-one million, eleven thousand, five hundred seventy-two".