91513487 has 8 divisors (see below), whose sum is σ = 98627760. Its totient is φ = 84409920.

The previous prime is 91513483. The next prime is 91513493. The reversal of 91513487 is 78431519.

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 91513487 - 2² = 91513483 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 91513487.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (91513483) 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, 29339 + ... + 32307.

It is an arithmetic number, because the mean of its divisors is an integer number (12328470).

Almost surely, 2^91513487 is an apocalyptic number.

91513487 is a deficient number, since it is larger than the sum of its proper divisors (7114273).

91513487 is a wasteful number, since it uses less digits than its factorization.

91513487 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5353.

The product of its digits is 30240, while the sum is 38.

The square root of 91513487 is about 9566.2681856615. The cubic root of 91513487 is about 450.6385781626.

The spelling of 91513487 in words is "ninety-one million, five hundred thirteen thousand, four hundred eighty-seven".