99790981831 has 16 divisors (see below), whose sum is σ = 106274420640. Its totient is φ = 93522764160.

The previous prime is 99790981819. The next prime is 99790981859. The reversal of 99790981831 is 13818909799.

It is a cyclic number.

It is not a de Polignac number, because 99790981831 - 2⁹ = 99790981319 is a prime.

It is a super-2 number, since 2×99790981831² (a number of 23 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (99790981811) 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 15 ways as a sum of consecutive naturals, for example, 341280 + ... + 562186.

It is an arithmetic number, because the mean of its divisors is an integer number (6642151290).

Almost surely, 2^99790981831 is an apocalyptic number.

99790981831 is a deficient number, since it is larger than the sum of its proper divisors (6483438809).

99790981831 is a wasteful number, since it uses less digits than its factorization.

99790981831 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 221394.

The product of its (nonzero) digits is 8817984, while the sum is 64.

The spelling of 99790981831 in words is "ninety-nine billion, seven hundred ninety million, nine hundred eighty-one thousand, eight hundred thirty-one".