91618959499 has 4 divisors (see below), whose sum is σ = 91619716336. Its totient is φ = 91618202664.

The previous prime is 91618959463. The next prime is 91618959559. The reversal of 91618959499 is 99495981619.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It is a cyclic number.

It is not a de Polignac number, because 91618959499 - 2¹⁹ = 91618435211 is a prime.

It is a super-3 number, since 3×91618959499³ (a number of 34 digits) contains 333 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (91618959449) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 151464 + ... + 454069.

It is an arithmetic number, because the mean of its divisors is an integer number (22904929084).

Almost surely, 2^91618959499 is an apocalyptic number.

91618959499 is a deficient number, since it is larger than the sum of its proper divisors (756837).

91618959499 is a wasteful number, since it uses less digits than its factorization.

91618959499 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 756836.

The product of its digits is 56687040, while the sum is 70.

The spelling of 91618959499 in words is "ninety-one billion, six hundred eighteen million, nine hundred fifty-nine thousand, four hundred ninety-nine".