11311998 has 16 divisors (see below), whose sum is σ = 23607936. Its totient is φ = 3606680.

The previous prime is 11311997. The next prime is 11311999. The reversal of 11311998 is 89911311.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (11311997) and next prime (11311999).

It is a super-2 number, since 2×11311998² = 255922597504008, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (11311997) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 40848 + ... + 41123.

It is an arithmetic number, because the mean of its divisors is an integer number (1475496).

Almost surely, 2^11311998 is an apocalyptic number.

11311998 is an abundant number, since it is smaller than the sum of its proper divisors (12295938).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

11311998 is a wasteful number, since it uses less digits than its factorization.

11311998 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 81999.

The product of its digits is 1944, while the sum is 33.

The square root of 11311998 is about 3363.3313842082. The cubic root of 11311998 is about 224.4810955588.

The spelling of 11311998 in words is "eleven million, three hundred eleven thousand, nine hundred ninety-eight".