91698961 has 4 divisors (see below), whose sum is σ = 94657024. Its totient is φ = 88740900.

The previous prime is 91698941. The next prime is 91698967. The reversal of 91698961 is 16989619.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 16989619 = 311 ⋅54629.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-91698961 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (91698967) 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, 1478985 + ... + 1479046.

It is an arithmetic number, because the mean of its divisors is an integer number (23664256).

Almost surely, 2^91698961 is an apocalyptic number.

It is an amenable number.

91698961 is a deficient number, since it is larger than the sum of its proper divisors (2958063).

91698961 is a wasteful number, since it uses less digits than its factorization.

91698961 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2958062.

The product of its digits is 209952, while the sum is 49.

The square root of 91698961 is about 9575.9574456030. The cubic root of 91698961 is about 450.9428150562.

The spelling of 91698961 in words is "ninety-one million, six hundred ninety-eight thousand, nine hundred sixty-one".