131689998 has 48 divisors (see below), whose sum is σ = 315244800. Its totient is φ = 39396240.

The previous prime is 131689997. The next prime is 131690003. The reversal of 131689998 is 899986131.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (131689997) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 11433 + ... + 19851.

It is an arithmetic number, because the mean of its divisors is an integer number (6567600).

Almost surely, 2^131689998 is an apocalyptic number.

131689998 is a gapful number since it is divisible by the number (18) formed by its first and last digit.

It is a practical number, because each smaller number is the sum of distinct divisors of 131689998, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (157622400).

131689998 is an abundant number, since it is smaller than the sum of its proper divisors (183554802).

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

131689998 is a wasteful number, since it uses less digits than its factorization.

131689998 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8517 (or 8514 counting only the distinct ones).

The product of its digits is 839808, while the sum is 54.

The square root of 131689998 is about 11475.6262574206. The cubic root of 131689998 is about 508.7654337129.

The spelling of 131689998 in words is "one hundred thirty-one million, six hundred eighty-nine thousand, nine hundred ninety-eight".