91516557 has 16 divisors (see below), whose sum is σ = 137410560. Its totient is φ = 53674800.

The previous prime is 91516543. The next prime is 91516583. The reversal of 91516557 is 75561519.

It is not a de Polignac number, because 91516557 - 2⁴ = 91516541 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (91516157) 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, 43707 + ... + 45752.

It is an arithmetic number, because the mean of its divisors is an integer number (8588160).

Almost surely, 2^91516557 is an apocalyptic number.

It is an amenable number.

91516557 is a deficient number, since it is larger than the sum of its proper divisors (45894003).

91516557 is a wasteful number, since it uses less digits than its factorization.

91516557 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 89504.

The product of its digits is 47250, while the sum is 39.

The square root of 91516557 is about 9566.4286439611. The cubic root of 91516557 is about 450.6436172922.

The spelling of 91516557 in words is "ninety-one million, five hundred sixteen thousand, five hundred fifty-seven".