309465473 has 2 divisors, whose sum is σ = 309465474. Its totient is φ = 309465472.

The previous prime is 309465461. The next prime is 309465479. The reversal of 309465473 is 374564903.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 274796929 + 34668544 = 16577^2 + 5888^2 .

It is an emirp because it is prime and its reverse (374564903) is a distict prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-309465473 is a prime.

It is a super-2 number, since 2×309465473² = 191537757958227458, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 309465473.

It is not a weakly prime, because it can be changed into another prime (309465479) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 154732736 + 154732737.

It is an arithmetic number, because the mean of its divisors is an integer number (154732737).

Almost surely, 2^309465473 is an apocalyptic number.

It is an amenable number.

309465473 is a deficient number, since it is larger than the sum of its proper divisors (1).

309465473 is an equidigital number, since it uses as much as digits as its factorization.

309465473 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 272160, while the sum is 41.

The square root of 309465473 is about 17591.6307657931. The cubic root of 309465473 is about 676.4007294847.

The spelling of 309465473 in words is "three hundred nine million, four hundred sixty-five thousand, four hundred seventy-three".