91642319 has 4 divisors (see below), whose sum is σ = 91661544. Its totient is φ = 91623096.

The previous prime is 91642307. The next prime is 91642333. The reversal of 91642319 is 91324619.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 91324619 = 47 ⋅1943077.

It is a cyclic number.

It is not a de Polignac number, because 91642319 - 2⁸ = 91642063 is a prime.

It is a super-2 number, since 2×91642319² = 16796629263395522, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (91642219) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3509 + ... + 13985.

It is an arithmetic number, because the mean of its divisors is an integer number (22915386).

Almost surely, 2^91642319 is an apocalyptic number.

91642319 is a deficient number, since it is larger than the sum of its proper divisors (19225).

91642319 is a wasteful number, since it uses less digits than its factorization.

91642319 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 19224.

The product of its digits is 11664, while the sum is 35.

The square root of 91642319 is about 9572.9994776977. Note that the first 3 decimals coincide. The cubic root of 91642319 is about 450.8499475414.

The spelling of 91642319 in words is "ninety-one million, six hundred forty-two thousand, three hundred nineteen".