91380015 has 64 divisors (see below), whose sum is σ = 178070400. Its totient is φ = 44255232.

The previous prime is 91380001. The next prime is 91380017. The reversal of 91380015 is 51008319.

It is not a de Polignac number, because 91380015 - 2⁵ = 91379983 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (91380017) by changing a digit.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 65869 + ... + 67241.

It is an arithmetic number, because the mean of its divisors is an integer number (2782350).

Almost surely, 2^91380015 is an apocalyptic number.

91380015 is a deficient number, since it is larger than the sum of its proper divisors (86690385).

91380015 is a wasteful number, since it uses less digits than its factorization.

91380015 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1433 (or 1427 counting only the distinct ones).

The product of its (nonzero) digits is 1080, while the sum is 27.

The square root of 91380015 is about 9559.2894610426. The cubic root of 91380015 is about 450.4193868002.

The spelling of 91380015 in words is "ninety-one million, three hundred eighty thousand, fifteen".