91615 has 8 divisors (see below), whose sum is σ = 111888. Its totient is φ = 72000.

The previous prime is 91591. The next prime is 91621. The reversal of 91615 is 51619.

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

It is not a de Polignac number, because 91615 - 2⁵ = 91583 is a prime.

It is a Duffinian number.

It is a plaindrome in base 14.

It is a zygodrome in base 3.

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, 240 + ... + 490.

It is an arithmetic number, because the mean of its divisors is an integer number (13986).

2⁹¹⁶¹⁵ is an apocalyptic number.

91615 is a deficient number, since it is larger than the sum of its proper divisors (20273).

91615 is a wasteful number, since it uses less digits than its factorization.

91615 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 329.

The product of its digits is 270, while the sum is 22.

The square root of 91615 is about 302.6796986915. The cubic root of 91615 is about 45.0805142936.

It can be divided in two parts, 9 and 1615, that multiplied together give a triangular number (14535 = T₁₇₀).

The spelling of 91615 in words is "ninety-one thousand, six hundred fifteen".