91516749 has 12 divisors (see below), whose sum is σ = 128784096. Its totient is φ = 57799368.

The previous prime is 91516741. The next prime is 91516757. The reversal of 91516749 is 94761519.

It is an interprime number because it is at equal distance from previous prime (91516741) and next prime (91516757).

It is not a de Polignac number, because 91516749 - 2³ = 91516741 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 91516749.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (91516741) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 41169 + ... + 43334.

It is an arithmetic number, because the mean of its divisors is an integer number (10732008).

Almost surely, 2^91516749 is an apocalyptic number.

It is an amenable number.

91516749 is a deficient number, since it is larger than the sum of its proper divisors (37267347).

91516749 is a wasteful number, since it uses less digits than its factorization.

91516749 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 84544 (or 84525 counting only the distinct ones).

The product of its digits is 68040, while the sum is 42.

The square root of 91516749 is about 9566.4386790488. The cubic root of 91516749 is about 450.6439324393.

The spelling of 91516749 in words is "ninety-one million, five hundred sixteen thousand, seven hundred forty-nine".