91950639 has 8 divisors (see below), whose sum is σ = 133746432. Its totient is φ = 55727640.

The previous prime is 91950629. The next prime is 91950673. The reversal of 91950639 is 93605919.

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

It is not a de Polignac number, because 91950639 - 2⁷ = 91950511 is a prime.

It is a Smith number, since the sum of its digits (42) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a self number, because there is not a number n which added to its sum of digits gives 91950639.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (91950629) 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, 1393159 + ... + 1393224.

It is an arithmetic number, because the mean of its divisors is an integer number (16718304).

Almost surely, 2^91950639 is an apocalyptic number.

91950639 is a deficient number, since it is larger than the sum of its proper divisors (41795793).

91950639 is a wasteful number, since it uses less digits than its factorization.

91950639 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2786397.

The product of its (nonzero) digits is 65610, while the sum is 42.

The square root of 91950639 is about 9589.0895813941. The cubic root of 91950639 is about 451.3549924381.

The spelling of 91950639 in words is "ninety-one million, nine hundred fifty thousand, six hundred thirty-nine".