131233009 has 4 divisors (see below), whose sum is σ = 136938816. Its totient is φ = 125527204.

The previous prime is 131232931. The next prime is 131233027. The reversal of 131233009 is 900332131.

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: 900332131 = 67 ⋅13437793.

It is a cyclic number.

It is not a de Polignac number, because 131233009 - 2¹³ = 131224817 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (131233309) 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, 2852869 + ... + 2852914.

It is an arithmetic number, because the mean of its divisors is an integer number (34234704).

Almost surely, 2^131233009 is an apocalyptic number.

It is an amenable number.

131233009 is a deficient number, since it is larger than the sum of its proper divisors (5705807).

131233009 is an equidigital number, since it uses as much as digits as its factorization.

131233009 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5705806.

The product of its (nonzero) digits is 486, while the sum is 22.

The square root of 131233009 is about 11455.6976653541. The cubic root of 131233009 is about 508.1762478223.

The spelling of 131233009 in words is "one hundred thirty-one million, two hundred thirty-three thousand, nine".