131223998 has 8 divisors (see below), whose sum is σ = 197465808. Its totient is φ = 65402064.

The previous prime is 131223991. The next prime is 131224007. The reversal of 131223998 is 899322131.

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

It is a super-2 number, since 2×131223998² = 34439475302208008, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (131223991) 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, 104186 + ... + 105437.

It is an arithmetic number, because the mean of its divisors is an integer number (24683226).

Almost surely, 2^131223998 is an apocalyptic number.

131223998 is a deficient number, since it is larger than the sum of its proper divisors (66241810).

131223998 is a wasteful number, since it uses less digits than its factorization.

131223998 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 209938.

The product of its digits is 23328, while the sum is 38.

The square root of 131223998 is about 11455.3043608627. The cubic root of 131223998 is about 508.1646163966.

The spelling of 131223998 in words is "one hundred thirty-one million, two hundred twenty-three thousand, nine hundred ninety-eight".