91617747 has 16 divisors (see below), whose sum is σ = 131728128. Its totient is φ = 56305440.

The previous prime is 91617731. The next prime is 91617751. The reversal of 91617747 is 74771619.

It is not a de Polignac number, because 91617747 - 2⁴ = 91617731 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 91617699 and 91617708.

It is not an unprimeable number, because it can be changed into a prime (91617727) 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, 49122 + ... + 50952.

It is an arithmetic number, because the mean of its divisors is an integer number (8233008).

Almost surely, 2^91617747 is an apocalyptic number.

91617747 is a deficient number, since it is larger than the sum of its proper divisors (40110381).

91617747 is a wasteful number, since it uses less digits than its factorization.

91617747 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3130.

The product of its digits is 74088, while the sum is 42.

The square root of 91617747 is about 9571.7159903541. The cubic root of 91617747 is about 450.8096485641.

The spelling of 91617747 in words is "ninety-one million, six hundred seventeen thousand, seven hundred forty-seven".