91959951 has 4 divisors (see below), whose sum is σ = 122613272. Its totient is φ = 61306632.

The previous prime is 91959947. The next prime is 91959971. The reversal of 91959951 is 15995919.

It is a happy number.

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

It is not a de Polignac number, because 91959951 - 2² = 91959947 is a prime.

It is a super-3 number, since 3×91959951³ (a number of 25 digits) contains 333 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 91959951.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (91959941) 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, 15326656 + ... + 15326661.

It is an arithmetic number, because the mean of its divisors is an integer number (30653318).

Almost surely, 2^91959951 is an apocalyptic number.

91959951 is a deficient number, since it is larger than the sum of its proper divisors (30653321).

91959951 is a wasteful number, since it uses less digits than its factorization.

91959951 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 30653320.

The product of its digits is 164025, while the sum is 48.

The square root of 91959951 is about 9589.5751209321. The cubic root of 91959951 is about 451.3702284236.

The spelling of 91959951 in words is "ninety-one million, nine hundred fifty-nine thousand, nine hundred fifty-one".