131505947 has 4 divisors (see below), whose sum is σ = 133090440. Its totient is φ = 129921456.

The previous prime is 131505919. The next prime is 131505967. The reversal of 131505947 is 749505131.

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

It is a cyclic number.

It is not a de Polignac number, because 131505947 - 2⁶ = 131505883 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (131505967) 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, 792122 + ... + 792287.

It is an arithmetic number, because the mean of its divisors is an integer number (33272610).

Almost surely, 2^131505947 is an apocalyptic number.

131505947 is a deficient number, since it is larger than the sum of its proper divisors (1584493).

131505947 is an equidigital number, since it uses as much as digits as its factorization.

131505947 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1584492.

The product of its (nonzero) digits is 18900, while the sum is 35.

The square root of 131505947 is about 11467.6042397704. The cubic root of 131505947 is about 508.5283049873.

The spelling of 131505947 in words is "one hundred thirty-one million, five hundred five thousand, nine hundred forty-seven".