309471497 has 2 divisors, whose sum is σ = 309471498. Its totient is φ = 309471496.

The previous prime is 309471493. The next prime is 309471517. The reversal of 309471497 is 794174903.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 177129481 + 132342016 = 13309^2 + 11504^2 .

It is a cyclic number.

It is not a de Polignac number, because 309471497 - 2² = 309471493 is a prime.

It is not a weakly prime, because it can be changed into another prime (309471493) 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 as a sum of consecutive naturals, namely, 154735748 + 154735749.

It is an arithmetic number, because the mean of its divisors is an integer number (154735749).

Almost surely, 2^309471497 is an apocalyptic number.

It is an amenable number.

309471497 is a deficient number, since it is larger than the sum of its proper divisors (1).

309471497 is an equidigital number, since it uses as much as digits as its factorization.

309471497 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 190512, while the sum is 44.

The square root of 309471497 is about 17591.8019827418. The cubic root of 309471497 is about 676.4051183551.

The spelling of 309471497 in words is "three hundred nine million, four hundred seventy-one thousand, four hundred ninety-seven".