331780609 has 4 divisors (see below), whose sum is σ = 332446000. Its totient is φ = 331115220.

The previous prime is 331780607. The next prime is 331780711. The reversal of 331780609 is 906087133.

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 a cyclic number.

It is not a de Polignac number, because 331780609 - 2¹ = 331780607 is a prime.

It is a super-2 number, since 2×331780609² = 220156745016821762, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (331780607) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 331947 + ... + 332944.

It is an arithmetic number, because the mean of its divisors is an integer number (83111500).

Almost surely, 2^331780609 is an apocalyptic number.

It is an amenable number.

331780609 is a deficient number, since it is larger than the sum of its proper divisors (665391).

331780609 is an equidigital number, since it uses as much as digits as its factorization.

331780609 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 665390.

The product of its (nonzero) digits is 27216, while the sum is 37.

The square root of 331780609 is about 18214.8458406872. The cubic root of 331780609 is about 692.2829994273.

The spelling of 331780609 in words is "three hundred thirty-one million, seven hundred eighty thousand, six hundred nine".