131390669 has 4 divisors (see below), whose sum is σ = 131421180. Its totient is φ = 131360160.

The previous prime is 131390639. The next prime is 131390689. The reversal of 131390669 is 966093131.

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 104816644 + 26574025 = 10238^2 + 5155^2 .

It is a cyclic number.

It is not a de Polignac number, because 131390669 - 2¹⁶ = 131325133 is a prime.

It is a super-2 number, since 2×131390669² = 34527015800535122, 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 (131390639) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 7472 + ... + 17849.

It is an arithmetic number, because the mean of its divisors is an integer number (32855295).

Almost surely, 2^131390669 is an apocalyptic number.

It is an amenable number.

131390669 is a deficient number, since it is larger than the sum of its proper divisors (30511).

131390669 is an equidigital number, since it uses as much as digits as its factorization.

131390669 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 30510.

The product of its (nonzero) digits is 26244, while the sum is 38.

The square root of 131390669 is about 11462.5768917814. The cubic root of 131390669 is about 508.3796697228.

The spelling of 131390669 in words is "one hundred thirty-one million, three hundred ninety thousand, six hundred sixty-nine".