998631310939 has 4 divisors (see below), whose sum is σ = 1051190853640. Its totient is φ = 946071768240.

The previous prime is 998631310889. The next prime is 998631310991. The reversal of 998631310939 is 939013136899.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 939013136899 = 140057 ⋅6704507.

It is not a de Polignac number, because 998631310939 - 2⁹ = 998631310427 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (998631314939) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 26279771322 + ... + 26279771359.

It is an arithmetic number, because the mean of its divisors is an integer number (262797713410).

Almost surely, 2^998631310939 is an apocalyptic number.

998631310939 is a deficient number, since it is larger than the sum of its proper divisors (52559542701).

998631310939 is a wasteful number, since it uses less digits than its factorization.

998631310939 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 52559542700.

The product of its (nonzero) digits is 8503056, while the sum is 61.

The spelling of 998631310939 in words is "nine hundred ninety-eight billion, six hundred thirty-one million, three hundred ten thousand, nine hundred thirty-nine".