91161512 has 48 divisors (see below), whose sum is σ = 192543540. Its totient is φ = 40220928.

The previous prime is 91161503. The next prime is 91161541. The reversal of 91161512 is 21516119.

It can be written as a sum of positive squares in 2 ways, for example, as 83795716 + 7365796 = 9154^2 + 2714^2 .

It is a super-2 number, since 2×91161512² = 16620842540252288, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (26).

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 54188 + ... + 55844.

Almost surely, 2^91161512 is an apocalyptic number.

91161512 is a gapful number since it is divisible by the number (92) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 91161512, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (96271770).

91161512 is an abundant number, since it is smaller than the sum of its proper divisors (101382028).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

91161512 is a wasteful number, since it uses less digits than its factorization.

91161512 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1722 (or 1695 counting only the distinct ones).

The product of its digits is 540, while the sum is 26.

The square root of 91161512 is about 9547.8537902505. The cubic root of 91161512 is about 450.0600940322.

The spelling of 91161512 in words is "ninety-one million, one hundred sixty-one thousand, five hundred twelve".