91657172 has 12 divisors (see below), whose sum is σ = 160862100. Its totient is φ = 45696576.

The previous prime is 91657171. The next prime is 91657199. The reversal of 91657172 is 27175619.

It can be written as a sum of positive squares in 2 ways, for example, as 82919236 + 8737936 = 9106^2 + 2956^2 .

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (91657171) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 31433 + ... + 34224.

It is an arithmetic number, because the mean of its divisors is an integer number (13405175).

Almost surely, 2^91657172 is an apocalyptic number.

It is an amenable number.

91657172 is a deficient number, since it is larger than the sum of its proper divisors (69204928).

91657172 is a wasteful number, since it uses less digits than its factorization.

91657172 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 66010 (or 66008 counting only the distinct ones).

The product of its digits is 26460, while the sum is 38.

The square root of 91657172 is about 9573.7752219279. The cubic root of 91657172 is about 450.8743035107.

The spelling of 91657172 in words is "ninety-one million, six hundred fifty-seven thousand, one hundred seventy-two".