91505972 has 12 divisors (see below), whose sum is σ = 161632800. Its totient is φ = 45325176.

The previous prime is 91505969. The next prime is 91505993. The reversal of 91505972 is 27950519.

It is a congruent number.

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, 106472 + ... + 107327.

It is an arithmetic number, because the mean of its divisors is an integer number (13469400).

Almost surely, 2^91505972 is an apocalyptic number.

It is an amenable number.

91505972 is a deficient number, since it is larger than the sum of its proper divisors (70126828).

91505972 is a wasteful number, since it uses less digits than its factorization.

91505972 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 213910 (or 213908 counting only the distinct ones).

The product of its (nonzero) digits is 28350, while the sum is 38.

The square root of 91505972 is about 9565.8753912018. The cubic root of 91505972 is about 450.6262424887.

The spelling of 91505972 in words is "ninety-one million, five hundred five thousand, nine hundred seventy-two".