309400811 has 2 divisors, whose sum is σ = 309400812. Its totient is φ = 309400810.

The previous prime is 309400783. The next prime is 309400823. The reversal of 309400811 is 118004903.

It is a strong prime.

It is an emirp because it is prime and its reverse (118004903) is a distict prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-309400811 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (309400831) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 154700405 + 154700406.

It is an arithmetic number, because the mean of its divisors is an integer number (154700406).

Almost surely, 2^309400811 is an apocalyptic number.

309400811 is a deficient number, since it is larger than the sum of its proper divisors (1).

309400811 is an equidigital number, since it uses as much as digits as its factorization.

309400811 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 864, while the sum is 26.

The square root of 309400811 is about 17589.7928071936. The cubic root of 309400811 is about 676.3536154829.

The spelling of 309400811 in words is "three hundred nine million, four hundred thousand, eight hundred eleven".