131689828 has 6 divisors (see below), whose sum is σ = 230457206. Its totient is φ = 65844912.

The previous prime is 131689823. The next prime is 131689847. The reversal of 131689828 is 828986131.

It can be written as a sum of positive squares in only one way, i.e., 84052224 + 47637604 = 9168^2 + 6902^2 .

It is not an unprimeable number, because it can be changed into a prime (131689823) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 16461225 + ... + 16461232.

Almost surely, 2^131689828 is an apocalyptic number.

It is an amenable number.

131689828 is a deficient number, since it is larger than the sum of its proper divisors (98767378).

131689828 is a wasteful number, since it uses less digits than its factorization.

131689828 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 32922461 (or 32922459 counting only the distinct ones).

The product of its digits is 165888, while the sum is 46.

The square root of 131689828 is about 11475.6188504150. The cubic root of 131689828 is about 508.7652147893.

The spelling of 131689828 in words is "one hundred thirty-one million, six hundred eighty-nine thousand, eight hundred twenty-eight".