131781015 has 24 divisors (see below), whose sum is σ = 229394880. Its totient is φ = 69983424.

The previous prime is 131780993. The next prime is 131781019. The reversal of 131781015 is 510187131.

It is not a de Polignac number, because 131781015 - 2⁹ = 131780503 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 131781015.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (131781019) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 4629 + ... + 16881.

It is an arithmetic number, because the mean of its divisors is an integer number (9558120).

Almost surely, 2^131781015 is an apocalyptic number.

131781015 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

131781015 is a deficient number, since it is larger than the sum of its proper divisors (97613865).

131781015 is a wasteful number, since it uses less digits than its factorization.

131781015 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12503 (or 12500 counting only the distinct ones).

The product of its (nonzero) digits is 840, while the sum is 27.

The square root of 131781015 is about 11479.5912383673. The cubic root of 131781015 is about 508.8826170985.

The spelling of 131781015 in words is "one hundred thirty-one million, seven hundred eighty-one thousand, fifteen".