91242487 has 8 divisors (see below), whose sum is σ = 104818976. Its totient is φ = 77801472.

The previous prime is 91242461. The next prime is 91242493. The reversal of 91242487 is 78424219.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a de Polignac number, because none of the positive numbers 2^k-91242487 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 (91242187) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 32418 + ... + 35119.

It is an arithmetic number, because the mean of its divisors is an integer number (13102372).

Almost surely, 2^91242487 is an apocalyptic number.

91242487 is a deficient number, since it is larger than the sum of its proper divisors (13576489).

91242487 is a wasteful number, since it uses less digits than its factorization.

91242487 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 67737.

The product of its digits is 32256, while the sum is 37.

The square root of 91242487 is about 9552.0933307836. The cubic root of 91242487 is about 450.1933111841.

It can be divided in two parts, 9124 and 2487, that added together give a palindrome (11611).

The spelling of 91242487 in words is "ninety-one million, two hundred forty-two thousand, four hundred eighty-seven".