131761820 has 24 divisors (see below), whose sum is σ = 276922800. Its totient is φ = 52662272.

The previous prime is 131761813. The next prime is 131761837. The reversal of 131761820 is 28167131.

It is a super-2 number, since 2×131761820² = 34722354419424800, which contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 37916 + ... + 41244.

It is an arithmetic number, because the mean of its divisors is an integer number (11538450).

Almost surely, 2^131761820 is an apocalyptic number.

131761820 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

131761820 is an abundant number, since it is smaller than the sum of its proper divisors (145160980).

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

131761820 is a wasteful number, since it uses less digits than its factorization.

131761820 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5317 (or 5315 counting only the distinct ones).

The product of its (nonzero) digits is 2016, while the sum is 29.

The square root of 131761820 is about 11478.7551589883. The cubic root of 131761820 is about 508.8579082380.

The spelling of 131761820 in words is "one hundred thirty-one million, seven hundred sixty-one thousand, eight hundred twenty".