131439769 has 4 divisors (see below), whose sum is σ = 131837200. Its totient is φ = 131042340.

The previous prime is 131439761. The next prime is 131439797. The reversal of 131439769 is 967934131.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 131439769 - 2³ = 131439761 is a prime.

It is a super-2 number, since 2×131439769² = 34552825749546722, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (131439761) 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, 198219 + ... + 198880.

It is an arithmetic number, because the mean of its divisors is an integer number (32959300).

Almost surely, 2^131439769 is an apocalyptic number.

It is an amenable number.

131439769 is a deficient number, since it is larger than the sum of its proper divisors (397431).

131439769 is an equidigital number, since it uses as much as digits as its factorization.

131439769 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 397430.

The product of its digits is 122472, while the sum is 43.

The square root of 131439769 is about 11464.7184439915. The cubic root of 131439769 is about 508.4429881033.

The spelling of 131439769 in words is "one hundred thirty-one million, four hundred thirty-nine thousand, seven hundred sixty-nine".