131495709 has 4 divisors (see below), whose sum is σ = 175327616. Its totient is φ = 87663804.

The previous prime is 131495701. The next prime is 131495717. The reversal of 131495709 is 907594131.

It is a happy number.

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 an interprime number because it is at equal distance from previous prime (131495701) and next prime (131495717).

It is not a de Polignac number, because 131495709 - 2³ = 131495701 is a prime.

It is a super-2 number, since 2×131495709² = 34582242970825362, which contains 22 as substring.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (131495701) 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, 21915949 + ... + 21915954.

It is an arithmetic number, because the mean of its divisors is an integer number (43831904).

Almost surely, 2^131495709 is an apocalyptic number.

It is an amenable number.

131495709 is a deficient number, since it is larger than the sum of its proper divisors (43831907).

131495709 is an equidigital number, since it uses as much as digits as its factorization.

131495709 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 43831906.

The product of its (nonzero) digits is 34020, while the sum is 39.

The square root of 131495709 is about 11467.1578431624. The cubic root of 131495709 is about 508.5151079976.

The spelling of 131495709 in words is "one hundred thirty-one million, four hundred ninety-five thousand, seven hundred nine".