131569998 has 40 divisors (see below), whose sum is σ = 307012008. Its totient is φ = 37587312.

The previous prime is 131569993. The next prime is 131570027. The reversal of 131569998 is 899965131.

It is a happy number.

It is a self number, because there is not a number n which added to its sum of digits gives 131569998.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (131569993) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 19 ways as a sum of consecutive naturals, for example, 9840 + ... + 18972.

Almost surely, 2^131569998 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 131569998, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (153506004).

131569998 is an abundant number, since it is smaller than the sum of its proper divisors (175442010).

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

131569998 is an frugal number, since it uses more digits than its factorization.

131569998 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9166 (or 9145 counting only the distinct ones).

The product of its digits is 524880, while the sum is 51.

The square root of 131569998 is about 11470.3965929692. The cubic root of 131569998 is about 508.6108524830.

The spelling of 131569998 in words is "one hundred thirty-one million, five hundred sixty-nine thousand, nine hundred ninety-eight".