91963013 has 4 divisors (see below), whose sum is σ = 97372620. Its totient is φ = 86553408.

The previous prime is 91963009. The next prime is 91963043. The reversal of 91963013 is 31036919.

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 37173409 + 54789604 = 6097^2 + 7402^2 .

It is a cyclic number.

It is not a de Polignac number, because 91963013 - 2² = 91963009 is a prime.

It is a super-3 number, since 3×91963013³ (a number of 25 digits) contains 333 as substring.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (91963043) 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, 2704778 + ... + 2704811.

It is an arithmetic number, because the mean of its divisors is an integer number (24343155).

Almost surely, 2^91963013 is an apocalyptic number.

It is an amenable number.

91963013 is a deficient number, since it is larger than the sum of its proper divisors (5409607).

91963013 is a wasteful number, since it uses less digits than its factorization.

91963013 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5409606.

The product of its (nonzero) digits is 4374, while the sum is 32.

The square root of 91963013 is about 9589.7347721405. The cubic root of 91963013 is about 451.3752381417.

The spelling of 91963013 in words is "ninety-one million, nine hundred sixty-three thousand, thirteen".