91089012 has 48 divisors (see below), whose sum is σ = 243798912. Its totient is φ = 25929600.

The previous prime is 91089001. The next prime is 91089023. The reversal of 91089012 is 21098019.

It is an interprime number because it is at equal distance from previous prime (91089001) and next prime (91089023).

It is a super-2 number, since 2×91089012² = 16594416214272288, 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 15 ways as a sum of consecutive naturals, for example, 22762 + ... + 26462.

It is an arithmetic number, because the mean of its divisors is an integer number (5079144).

Almost surely, 2^91089012 is an apocalyptic number.

It is an amenable number.

91089012 is an abundant number, since it is smaller than the sum of its proper divisors (152709900).

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

91089012 is a wasteful number, since it uses less digits than its factorization.

91089012 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4008 (or 4006 counting only the distinct ones).

The product of its (nonzero) digits is 1296, while the sum is 30.

The square root of 91089012 is about 9544.0563703281. The cubic root of 91089012 is about 449.9407526936.

The spelling of 91089012 in words is "ninety-one million, eighty-nine thousand, twelve".