91621732 has 12 divisors (see below), whose sum is σ = 161170156. Its totient is φ = 45573120.

The previous prime is 91621729. The next prime is 91621741. The reversal of 91621732 is 23712619.

It can be written as a sum of positive squares in 2 ways, for example, as 16695396 + 74926336 = 4086^2 + 8656^2 .

It is a junction number, because it is equal to n+sod(n) for n = 91621694 and 91621703.

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, 58569 + ... + 60112.

Almost surely, 2^91621732 is an apocalyptic number.

It is an amenable number.

91621732 is a deficient number, since it is larger than the sum of its proper divisors (69548424).

91621732 is a wasteful number, since it uses less digits than its factorization.

91621732 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 118878 (or 118876 counting only the distinct ones).

The product of its digits is 4536, while the sum is 31.

The square root of 91621732 is about 9571.9241534814. The cubic root of 91621732 is about 450.8161845991.

The spelling of 91621732 in words is "ninety-one million, six hundred twenty-one thousand, seven hundred thirty-two".