99913071731 has 8 divisors (see below), whose sum is σ = 113735038464. Its totient is φ = 86880931720.

The previous prime is 99913071691. The next prime is 99913071809. The reversal of 99913071731 is 13717031999.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 99913071731 - 2¹⁰ = 99913070707 is a prime.

It is a super-2 number, since 2×99913071731² (a number of 23 digits) contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 99913071731.

It is not an unprimeable number, because it can be changed into a prime (99913071031) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 197456411 + ... + 197456916.

It is an arithmetic number, because the mean of its divisors is an integer number (14216879808).

Almost surely, 2^99913071731 is an apocalyptic number.

99913071731 is a deficient number, since it is larger than the sum of its proper divisors (13821966733).

99913071731 is a wasteful number, since it uses less digits than its factorization.

99913071731 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 394913361.

The product of its (nonzero) digits is 321489, while the sum is 50.

The spelling of 99913071731 in words is "ninety-nine billion, nine hundred thirteen million, seventy-one thousand, seven hundred thirty-one".