91617615 has 16 divisors (see below), whose sum is σ = 162876000. Its totient is φ = 48862656.

The previous prime is 91617613. The next prime is 91617629. The reversal of 91617615 is 51671619.

It is a happy number.

It is not a de Polignac number, because 91617615 - 2¹ = 91617613 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 91617615.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (91617611) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 339190 + ... + 339459.

It is an arithmetic number, because the mean of its divisors is an integer number (10179750).

Almost surely, 2^91617615 is an apocalyptic number.

91617615 is a deficient number, since it is larger than the sum of its proper divisors (71258385).

91617615 is a wasteful number, since it uses less digits than its factorization.

91617615 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 678663 (or 678657 counting only the distinct ones).

The product of its digits is 11340, while the sum is 36.

The square root of 91617615 is about 9571.7090950363. The cubic root of 91617615 is about 450.8094320598.

The spelling of 91617615 in words is "ninety-one million, six hundred seventeen thousand, six hundred fifteen".