131811867 has 20 divisors (see below), whose sum is σ = 214805976. Its totient is φ = 79885440.

The previous prime is 131811857. The next prime is 131811877. The reversal of 131811867 is 768118131.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (131811857) and next prime (131811877).

It is not a de Polignac number, because 131811867 - 2⁶ = 131811803 is a prime.

It is a hoax number, since the sum of its digits (36) coincides with the sum of the digits of its distinct prime factors.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (131811857) by changing a digit.

It is a polite number, since it can be written in 19 ways as a sum of consecutive naturals, for example, 73078 + ... + 74859.

Almost surely, 2^131811867 is an apocalyptic number.

131811867 is a deficient number, since it is larger than the sum of its proper divisors (82994109).

131811867 is a wasteful number, since it uses less digits than its factorization.

131811867 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 147960 (or 147951 counting only the distinct ones).

The product of its digits is 8064, while the sum is 36.

The square root of 131811867 is about 11480.9349357968. The cubic root of 131811867 is about 508.9223264639.

Adding to 131811867 its reverse (768118131), we get a palindrome (899929998).

The spelling of 131811867 in words is "one hundred thirty-one million, eight hundred eleven thousand, eight hundred sixty-seven".