131243756 has 18 divisors (see below), whose sum is σ = 267175188. Its totient is φ = 56247240.

The previous prime is 131243729. The next prime is 131243767. The reversal of 131243756 is 657342131.

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 5 ways as a sum of consecutive naturals, for example, 334610 + ... + 335001.

It is an arithmetic number, because the mean of its divisors is an integer number (14843066).

Almost surely, 2^131243756 is an apocalyptic number.

It is an amenable number.

131243756 is an abundant number, since it is smaller than the sum of its proper divisors (135931432).

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

131243756 is a wasteful number, since it uses less digits than its factorization.

131243756 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 669629 (or 669620 counting only the distinct ones).

The product of its digits is 15120, while the sum is 32.

The square root of 131243756 is about 11456.1667236471. The cubic root of 131243756 is about 508.1901193858.

Adding to 131243756 its reverse (657342131), we get a palindrome (788585887).

It can be divided in two parts, 131 and 243756, that multiplied together give a triangular number (31932036 = T₇₉₉₁).

The spelling of 131243756 in words is "one hundred thirty-one million, two hundred forty-three thousand, seven hundred fifty-six".