131332309 has 4 divisors (see below), whose sum is σ = 131596000. Its totient is φ = 131068620.

The previous prime is 131332297. The next prime is 131332319. The reversal of 131332309 is 903233131.

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, and also an emirpimes, since its reverse is a distinct semiprime: 903233131 = 331 ⋅2728801.

It is a cyclic number.

It is not a de Polignac number, because 131332309 - 2¹³ = 131324117 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (131332319) 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, 131097 + ... + 132094.

It is an arithmetic number, because the mean of its divisors is an integer number (32899000).

Almost surely, 2^131332309 is an apocalyptic number.

It is an amenable number.

131332309 is a deficient number, since it is larger than the sum of its proper divisors (263691).

131332309 is an equidigital number, since it uses as much as digits as its factorization.

131332309 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 263690.

The product of its (nonzero) digits is 1458, while the sum is 25.

The square root of 131332309 is about 11460.0309336406. The cubic root of 131332309 is about 508.3043893102.

The spelling of 131332309 in words is "one hundred thirty-one million, three hundred thirty-two thousand, three hundred nine".