91720132970 has 8 divisors (see below), whose sum is σ = 165096239364. Its totient is φ = 36688053184.

The previous prime is 91720132943. The next prime is 91720132979. The reversal of 91720132970 is 7923102719.

It can be written as a sum of positive squares in 2 ways, for example, as 80009213881 + 11710919089 = 282859^2 + 108217^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is not an unprimeable number, because it can be changed into a prime (91720132979) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 4586006639 + ... + 4586006658.

Almost surely, 2^91720132970 is an apocalyptic number.

91720132970 is a deficient number, since it is larger than the sum of its proper divisors (73376106394).

91720132970 is a wasteful number, since it uses less digits than its factorization.

91720132970 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9172013304.

The product of its (nonzero) digits is 47628, while the sum is 41.

The spelling of 91720132970 in words is "ninety-one billion, seven hundred twenty million, one hundred thirty-two thousand, nine hundred seventy".