91072011 has 16 divisors (see below), whose sum is σ = 123136416. Its totient is φ = 59867136.

The previous prime is 91071971. The next prime is 91072021. The reversal of 91072011 is 11027019.

It is not a de Polignac number, because 91072011 - 2¹¹ = 91069963 is a prime.

It is a super-2 number, since 2×91072011² = 16588222375168242, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (91072021) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 78411 + ... + 79563.

It is an arithmetic number, because the mean of its divisors is an integer number (7696026).

Almost surely, 2^91072011 is an apocalyptic number.

91072011 is a deficient number, since it is larger than the sum of its proper divisors (32064405).

91072011 is a wasteful number, since it uses less digits than its factorization.

91072011 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1502.

The product of its (nonzero) digits is 126, while the sum is 21.

The square root of 91072011 is about 9543.1656697345. The cubic root of 91072011 is about 449.9127583962.

The spelling of 91072011 in words is "ninety-one million, seventy-two thousand, eleven".