331406902609 has 4 divisors (see below), whose sum is σ = 331664007780. Its totient is φ = 331149797440.

The previous prime is 331406902601. The next prime is 331406902637. The reversal of 331406902609 is 906209604133.

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

It can be written as a sum of positive squares in 2 ways, for example, as 195063555600 + 136343347009 = 441660^2 + 369247^2 .

It is a cyclic number.

It is not a de Polignac number, because 331406902609 - 2³ = 331406902601 is a prime.

It is a super-2 number, since 2×331406902609² (a number of 24 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (331406902601) 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, 128550652 + ... + 128553229.

It is an arithmetic number, because the mean of its divisors is an integer number (82916001945).

Almost surely, 2^331406902609 is an apocalyptic number.

It is an amenable number.

331406902609 is a deficient number, since it is larger than the sum of its proper divisors (257105171).

331406902609 is a wasteful number, since it uses less digits than its factorization.

331406902609 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 257105170.

The product of its (nonzero) digits is 209952, while the sum is 43.

The spelling of 331406902609 in words is "three hundred thirty-one billion, four hundred six million, nine hundred two thousand, six hundred nine".