131609435 has 4 divisors (see below), whose sum is σ = 157931328. Its totient is φ = 105287544.

The previous prime is 131609431. The next prime is 131609483. The reversal of 131609435 is 534906131.

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 131609435 - 2² = 131609431 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (131609431) 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, 13160939 + ... + 13160948.

It is an arithmetic number, because the mean of its divisors is an integer number (39482832).

Almost surely, 2^131609435 is an apocalyptic number.

131609435 is a deficient number, since it is larger than the sum of its proper divisors (26321893).

131609435 is an equidigital number, since it uses as much as digits as its factorization.

131609435 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 26321892.

The product of its (nonzero) digits is 9720, while the sum is 32.

The square root of 131609435 is about 11472.1155416078. The cubic root of 131609435 is about 508.6616646812.

The spelling of 131609435 in words is "one hundred thirty-one million, six hundred nine thousand, four hundred thirty-five".