91581465032 has 8 divisors (see below), whose sum is σ = 171715246950. Its totient is φ = 45790732512.

The previous prime is 91581464999. The next prime is 91581465061. The reversal of 91581465032 is 23056418519.

It is a happy number.

It can be written as a sum of positive squares in only one way, i.e., 78302590276 + 13278874756 = 279826^2 + 115234^2 .

It is a tau number, because it is divible by the number of its divisors (8).

It is a super-2 number, since 2×91581465032² (a number of 23 digits) contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5723841557 + ... + 5723841572.

Almost surely, 2^91581465032 is an apocalyptic number.

It is an amenable number.

91581465032 is a deficient number, since it is larger than the sum of its proper divisors (80133781918).

91581465032 is a wasteful number, since it uses less digits than its factorization.

91581465032 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11447683135 (or 11447683131 counting only the distinct ones).

The product of its (nonzero) digits is 259200, while the sum is 44.

The spelling of 91581465032 in words is "ninety-one billion, five hundred eighty-one million, four hundred sixty-five thousand, thirty-two".