91547679 has 4 divisors (see below), whose sum is σ = 122063576. Its totient is φ = 61031784.

The previous prime is 91547663. The next prime is 91547689. The reversal of 91547679 is 97674519.

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 97674519 = 3 ⋅32558173.

It is not a de Polignac number, because 91547679 - 2⁴ = 91547663 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (91547689) 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, 15257944 + ... + 15257949.

It is an arithmetic number, because the mean of its divisors is an integer number (30515894).

Almost surely, 2^91547679 is an apocalyptic number.

91547679 is a deficient number, since it is larger than the sum of its proper divisors (30515897).

91547679 is a wasteful number, since it uses less digits than its factorization.

91547679 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 30515896.

The product of its digits is 476280, while the sum is 48.

The square root of 91547679 is about 9568.0551315301. The cubic root of 91547679 is about 450.6946949027.

The spelling of 91547679 in words is "ninety-one million, five hundred forty-seven thousand, six hundred seventy-nine".