91617799 has 12 divisors (see below), whose sum is σ = 114774744. Its totient is φ = 72488304.

The previous prime is 91617797. The next prime is 91617857. The reversal of 91617799 is 99771619.

It is a happy number.

It is not a de Polignac number, because 91617799 - 2¹ = 91617797 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (49).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (91617793) 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, 71277 + ... + 72550.

It is an arithmetic number, because the mean of its divisors is an integer number (9564562).

Almost surely, 2^91617799 is an apocalyptic number.

91617799 is a deficient number, since it is larger than the sum of its proper divisors (23156945).

91617799 is a wasteful number, since it uses less digits than its factorization.

91617799 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 143854 (or 143847 counting only the distinct ones).

The product of its digits is 214326, while the sum is 49.

The square root of 91617799 is about 9571.7187066900. The cubic root of 91617799 is about 450.8097338536.

It can be divided in two parts, 91617 and 799, that added together give a square (92416 = 304²).

The spelling of 91617799 in words is "ninety-one million, six hundred seventeen thousand, seven hundred ninety-nine".