131387005 has 4 divisors (see below), whose sum is σ = 157664412. Its totient is φ = 105109600.

The previous prime is 131386987. The next prime is 131387029. The reversal of 131387005 is 500783131.

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

It can be written as a sum of positive squares in 2 ways, for example, as 99780121 + 31606884 = 9989^2 + 5622^2 .

It is a de Polignac number, because none of the positive numbers 2^k-131387005 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 13138696 + ... + 13138705.

It is an arithmetic number, because the mean of its divisors is an integer number (39416103).

Almost surely, 2^131387005 is an apocalyptic number.

It is an amenable number.

131387005 is a deficient number, since it is larger than the sum of its proper divisors (26277407).

131387005 is an equidigital number, since it uses as much as digits as its factorization.

131387005 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 26277406.

The product of its (nonzero) digits is 2520, while the sum is 28.

The square root of 131387005 is about 11462.4170662212. The cubic root of 131387005 is about 508.3749440691.

The spelling of 131387005 in words is "one hundred thirty-one million, three hundred eighty-seven thousand, five".