91012479 has 4 divisors (see below), whose sum is σ = 121349976. Its totient is φ = 60674984.

The previous prime is 91012459. The next prime is 91012487. The reversal of 91012479 is 97421019.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 97421019 = 3 ⋅32473673.

It is a cyclic number.

It is not a de Polignac number, because 91012479 - 2⁵ = 91012447 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (91012459) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 15168744 + ... + 15168749.

It is an arithmetic number, because the mean of its divisors is an integer number (30337494).

Almost surely, 2^91012479 is an apocalyptic number.

91012479 is a deficient number, since it is larger than the sum of its proper divisors (30337497).

91012479 is a wasteful number, since it uses less digits than its factorization.

91012479 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 30337496.

The product of its (nonzero) digits is 4536, while the sum is 33.

The square root of 91012479 is about 9540.0460690712. The cubic root of 91012479 is about 449.8147039582.

The spelling of 91012479 in words is "ninety-one million, twelve thousand, four hundred seventy-nine".