91242407 has 4 divisors (see below), whose sum is σ = 93708456. Its totient is φ = 88776360.

The previous prime is 91242391. The next prime is 91242421. The reversal of 91242407 is 70424219.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 70424219 = 31 ⋅2271749.

It is a cyclic number.

It is not a de Polignac number, because 91242407 - 2⁴ = 91242391 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 91242407.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (91242707) 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, 1232969 + ... + 1233042.

It is an arithmetic number, because the mean of its divisors is an integer number (23427114).

Almost surely, 2^91242407 is an apocalyptic number.

91242407 is a deficient number, since it is larger than the sum of its proper divisors (2466049).

91242407 is a wasteful number, since it uses less digits than its factorization.

91242407 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2466048.

The product of its (nonzero) digits is 4032, while the sum is 29.

The square root of 91242407 is about 9552.0891432189. The cubic root of 91242407 is about 450.1931796099.

The spelling of 91242407 in words is "ninety-one million, two hundred forty-two thousand, four hundred seven".