131281515 has 24 divisors (see below), whose sum is σ = 230302800. Its totient is φ = 69171264.

The previous prime is 131281487. The next prime is 131281523. The reversal of 131281515 is 515182131.

It is not a de Polignac number, because 131281515 - 2¹⁴ = 131265131 is a prime.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 13840 + ... + 21309.

It is an arithmetic number, because the mean of its divisors is an integer number (9595950).

Almost surely, 2^131281515 is an apocalyptic number.

131281515 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

131281515 is a deficient number, since it is larger than the sum of its proper divisors (99021285).

131281515 is a wasteful number, since it uses less digits than its factorization.

131281515 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 35243 (or 35240 counting only the distinct ones).

The product of its digits is 1200, while the sum is 27.

The square root of 131281515 is about 11457.8145821967. The cubic root of 131281515 is about 508.2388503665.

The spelling of 131281515 in words is "one hundred thirty-one million, two hundred eighty-one thousand, five hundred fifteen".