131811868 has 24 divisors (see below), whose sum is σ = 233803584. Its totient is φ = 65016000.

The previous prime is 131811857. The next prime is 131811877. The reversal of 131811868 is 868118131.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 173746 + ... + 174502.

It is an arithmetic number, because the mean of its divisors is an integer number (9741816).

Almost surely, 2^131811868 is an apocalyptic number.

It is an amenable number.

131811868 is a deficient number, since it is larger than the sum of its proper divisors (101991716).

131811868 is a wasteful number, since it uses less digits than its factorization.

131811868 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1293 (or 1291 counting only the distinct ones).

The product of its digits is 9216, while the sum is 37.

The square root of 131811868 is about 11480.9349793473. The cubic root of 131811868 is about 508.9223277509.

Adding to 131811868 its reverse (868118131), we get a palindrome (999929999).

The spelling of 131811868 in words is "one hundred thirty-one million, eight hundred eleven thousand, eight hundred sixty-eight".