131215784 has 16 divisors (see below), whose sum is σ = 281176800. Its totient is φ = 56235312.

The previous prime is 131215781. The next prime is 131215793. The reversal of 131215784 is 487512131.

It is a self number, because there is not a number n which added to its sum of digits gives 131215784.

It is not an unprimeable number, because it can be changed into a prime (131215781) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1171514 + ... + 1171625.

It is an arithmetic number, because the mean of its divisors is an integer number (17573550).

Almost surely, 2^131215784 is an apocalyptic number.

131215784 is a gapful number since it is divisible by the number (14) formed by its first and last digit.

It is an amenable number.

131215784 is an abundant number, since it is smaller than the sum of its proper divisors (149961016).

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

131215784 is a wasteful number, since it uses less digits than its factorization.

131215784 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2343152 (or 2343148 counting only the distinct ones).

The product of its digits is 6720, while the sum is 32.

The square root of 131215784 is about 11454.9458313865. The cubic root of 131215784 is about 508.1540132770.

The spelling of 131215784 in words is "one hundred thirty-one million, two hundred fifteen thousand, seven hundred eighty-four".