91617473 has 4 divisors (see below), whose sum is σ = 91948500. Its totient is φ = 91286448.

The previous prime is 91617469. The next prime is 91617479. The reversal of 91617473 is 37471619.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 5276209 + 86341264 = 2297^2 + 9292^2 .

It is a cyclic number.

It is not a de Polignac number, because 91617473 - 2² = 91617469 is a prime.

It is a super-2 number, since 2×91617473² = 16787522717811458, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (91617479) 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, 165098 + ... + 165651.

It is an arithmetic number, because the mean of its divisors is an integer number (22987125).

Almost surely, 2^91617473 is an apocalyptic number.

It is an amenable number.

91617473 is a deficient number, since it is larger than the sum of its proper divisors (331027).

91617473 is a wasteful number, since it uses less digits than its factorization.

91617473 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 331026.

The product of its digits is 31752, while the sum is 38.

The square root of 91617473 is about 9571.7016773403. The cubic root of 91617473 is about 450.8091991534.

The spelling of 91617473 in words is "ninety-one million, six hundred seventeen thousand, four hundred seventy-three".