131573687 has 4 divisors (see below), whose sum is σ = 150369936. Its totient is φ = 112777440.

The previous prime is 131573683. The next prime is 131573723. The reversal of 131573687 is 786375131.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 131573687 - 2² = 131573683 is a prime.

It is a super-2 number, since 2×131573687² = 34623270221547938, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (131573683) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 9398114 + ... + 9398127.

It is an arithmetic number, because the mean of its divisors is an integer number (37592484).

Almost surely, 2^131573687 is an apocalyptic number.

131573687 is a deficient number, since it is larger than the sum of its proper divisors (18796249).

131573687 is an equidigital number, since it uses as much as digits as its factorization.

131573687 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 18796248.

The product of its digits is 105840, while the sum is 41.

The square root of 131573687 is about 11470.5573970928. The cubic root of 131573687 is about 508.6156059677.

The spelling of 131573687 in words is "one hundred thirty-one million, five hundred seventy-three thousand, six hundred eighty-seven".