91983961 has 8 divisors (see below), whose sum is σ = 94731264. Its totient is φ = 89250480.

The previous prime is 91983953. The next prime is 91983967. The reversal of 91983961 is 16938919.

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

It is a cyclic number.

It is not a de Polignac number, because 91983961 - 2³ = 91983953 is a prime.

It is a super-2 number, since 2×91983961² = 16922098162499042, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (91983967) 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, 10926 + ... + 17416.

It is an arithmetic number, because the mean of its divisors is an integer number (11841408).

Almost surely, 2^91983961 is an apocalyptic number.

It is an amenable number.

91983961 is a deficient number, since it is larger than the sum of its proper divisors (2747303).

91983961 is a wasteful number, since it uses less digits than its factorization.

91983961 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6911.

The product of its digits is 104976, while the sum is 46.

The square root of 91983961 is about 9590.8269195101. The cubic root of 91983961 is about 451.4095080449.

The spelling of 91983961 in words is "ninety-one million, nine hundred eighty-three thousand, nine hundred sixty-one".