131512666 has 32 divisors (see below), whose sum is σ = 213228288. Its totient is φ = 60677760.

The previous prime is 131512657. The next prime is 131512679. The reversal of 131512666 is 666215131.

It is an unprimeable number.

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 15 ways as a sum of consecutive naturals, for example, 193920 + ... + 194596.

It is an arithmetic number, because the mean of its divisors is an integer number (6663384).

Almost surely, 2^131512666 is an apocalyptic number.

131512666 is a deficient number, since it is larger than the sum of its proper divisors (81715622).

131512666 is a wasteful number, since it uses less digits than its factorization.

131512666 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 846.

The product of its digits is 6480, while the sum is 31.

The square root of 131512666 is about 11467.8971917261. The cubic root of 131512666 is about 508.5369655424.

Adding to 131512666 its reverse (666215131), we get a palindrome (797727797).

The spelling of 131512666 in words is "one hundred thirty-one million, five hundred twelve thousand, six hundred sixty-six".