131201787 has 4 divisors (see below), whose sum is σ = 174935720. Its totient is φ = 87467856.

The previous prime is 131201773. The next prime is 131201813. The reversal of 131201787 is 787102131.

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

It is not a de Polignac number, because 131201787 - 2⁶ = 131201723 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (131201737) 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, 21866962 + ... + 21866967.

It is an arithmetic number, because the mean of its divisors is an integer number (43733930).

Almost surely, 2^131201787 is an apocalyptic number.

131201787 is a deficient number, since it is larger than the sum of its proper divisors (43733933).

131201787 is an equidigital number, since it uses as much as digits as its factorization.

131201787 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 43733932.

The product of its (nonzero) digits is 2352, while the sum is 30.

The square root of 131201787 is about 11454.3348562891. The cubic root of 131201787 is about 508.1359440975.

The spelling of 131201787 in words is "one hundred thirty-one million, two hundred one thousand, seven hundred eighty-seven".