91642385 has 4 divisors (see below), whose sum is σ = 109970868. Its totient is φ = 73313904.

The previous prime is 91642381. The next prime is 91642387. The reversal of 91642385 is 58324619.

It is a happy number.

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 23464336 + 68178049 = 4844^2 + 8257^2 .

It is a cyclic number.

It is not a de Polignac number, because 91642385 - 2² = 91642381 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (91642381) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 9164234 + ... + 9164243.

It is an arithmetic number, because the mean of its divisors is an integer number (27492717).

Almost surely, 2^91642385 is an apocalyptic number.

It is an amenable number.

91642385 is a deficient number, since it is larger than the sum of its proper divisors (18328483).

91642385 is a wasteful number, since it uses less digits than its factorization.

91642385 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 18328482.

The product of its digits is 51840, while the sum is 38.

The square root of 91642385 is about 9573.0029248925. The cubic root of 91642385 is about 450.8500557741.

The spelling of 91642385 in words is "ninety-one million, six hundred forty-two thousand, three hundred eighty-five".