345631009 has 2 divisors, whose sum is σ = 345631010. Its totient is φ = 345631008.

The previous prime is 345631003. The next prime is 345631031. The reversal of 345631009 is 900136543.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 294465600 + 51165409 = 17160^2 + 7153^2 .

It is a cyclic number.

It is not a de Polignac number, because 345631009 - 2³ = 345631001 is a prime.

It is not a weakly prime, because it can be changed into another prime (345631001) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 172815504 + 172815505.

It is an arithmetic number, because the mean of its divisors is an integer number (172815505).

Almost surely, 2^345631009 is an apocalyptic number.

It is an amenable number.

345631009 is a deficient number, since it is larger than the sum of its proper divisors (1).

345631009 is an equidigital number, since it uses as much as digits as its factorization.

345631009 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 9720, while the sum is 31.

The square root of 345631009 is about 18591.1540523981. The cubic root of 345631009 is about 701.7852451698.

The spelling of 345631009 in words is "three hundred forty-five million, six hundred thirty-one thousand, nine".