91961317 has 8 divisors (see below), whose sum is σ = 107939456. Its totient is φ = 76693392.

The previous prime is 91961299. The next prime is 91961323. The reversal of 91961317 is 71316919.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-91961317 is a prime.

It is a super-3 number, since 3×91961317³ (a number of 25 digits) contains 333 as substring.

It is a Harshad number since it is a multiple of its sum of digits (37).

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (91961327) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 177273 + ... + 177790.

It is an arithmetic number, because the mean of its divisors is an integer number (13492432).

Almost surely, 2^91961317 is an apocalyptic number.

It is an amenable number.

91961317 is a deficient number, since it is larger than the sum of its proper divisors (15978139).

91961317 is a wasteful number, since it uses less digits than its factorization.

91961317 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 355107.

The product of its digits is 10206, while the sum is 37.

The square root of 91961317 is about 9589.6463438440. The cubic root of 91961317 is about 451.3724633410.

The spelling of 91961317 in words is "ninety-one million, nine hundred sixty-one thousand, three hundred seventeen".