91621015 has 8 divisors (see below), whose sum is σ = 109998288. Its totient is φ = 73261440.

The previous prime is 91621009. The next prime is 91621037. The reversal of 91621015 is 51012619.

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

It is not a de Polignac number, because 91621015 - 2¹⁵ = 91588247 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 13800 + ... + 19330.

It is an arithmetic number, because the mean of its divisors is an integer number (13749786).

Almost surely, 2^91621015 is an apocalyptic number.

91621015 is a deficient number, since it is larger than the sum of its proper divisors (18377273).

91621015 is a wasteful number, since it uses less digits than its factorization.

91621015 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8849.

The product of its (nonzero) digits is 540, while the sum is 25.

The square root of 91621015 is about 9571.8867001234. The cubic root of 91621015 is about 450.8150086188.

The spelling of 91621015 in words is "ninety-one million, six hundred twenty-one thousand, fifteen".