131287890 has 32 divisors (see below), whose sum is σ = 321039936. Its totient is φ = 34349120.

The previous prime is 131287879. The next prime is 131287903. The reversal of 131287890 is 98782131.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 39696 + ... + 42875.

It is an arithmetic number, because the mean of its divisors is an integer number (10032498).

Almost surely, 2^131287890 is an apocalyptic number.

131287890 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

131287890 is an abundant number, since it is smaller than the sum of its proper divisors (189752046).

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

131287890 is a wasteful number, since it uses less digits than its factorization.

131287890 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 82634.

The product of its (nonzero) digits is 24192, while the sum is 39.

The square root of 131287890 is about 11458.0927732324. The cubic root of 131287890 is about 508.2470768870.

The spelling of 131287890 in words is "one hundred thirty-one million, two hundred eighty-seven thousand, eight hundred ninety".