91357487 has 8 divisors (see below), whose sum is σ = 98494704. Its totient is φ = 84235968.

The previous prime is 91357481. The next prime is 91357493. The reversal of 91357487 is 78475319.

It is an interprime number because it is at equal distance from previous prime (91357481) and next prime (91357493).

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

It is a cyclic number.

It is not a de Polignac number, because 91357487 - 2⁶ = 91357423 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 (91357481) 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, 10028 + ... + 16830.

It is an arithmetic number, because the mean of its divisors is an integer number (12311838).

Almost surely, 2^91357487 is an apocalyptic number.

91357487 is a deficient number, since it is larger than the sum of its proper divisors (7137217).

91357487 is a wasteful number, since it uses less digits than its factorization.

91357487 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7849.

The product of its digits is 211680, while the sum is 44.

The square root of 91357487 is about 9558.1110581537. Note that the first 3 decimals coincide. The cubic root of 91357487 is about 450.3823696547.

The spelling of 91357487 in words is "ninety-one million, three hundred fifty-seven thousand, four hundred eighty-seven".