998111731 has 4 divisors (see below), whose sum is σ = 1000972000. Its totient is φ = 995251464.

The previous prime is 998111713. The next prime is 998111747. The reversal of 998111731 is 137111899.

998111731 = T₂₅₇₉₄ + T₂₅₇₉₅ + T₂₅₇₉₆.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-998111731 is a prime.

It is a super-2 number, since 2×998111731² = 1992454055119632722, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (998111761) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1429611 + ... + 1430308.

It is an arithmetic number, because the mean of its divisors is an integer number (250243000).

Almost surely, 2^998111731 is an apocalyptic number.

998111731 is the 25796-th centered triangular number.

998111731 is a deficient number, since it is larger than the sum of its proper divisors (2860269).

998111731 is a wasteful number, since it uses less digits than its factorization.

998111731 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2860268.

The product of its digits is 13608, while the sum is 40.

The square root of 998111731 is about 31592.9063398732. The cubic root of 998111731 is about 999.3701804106.

It can be divided in two parts, 9981 and 11731, that added together give a palindrome (21712).

The spelling of 998111731 in words is "nine hundred ninety-eight million, one hundred eleven thousand, seven hundred thirty-one".