309342277649 has 2 divisors, whose sum is σ = 309342277650. Its totient is φ = 309342277648.

The previous prime is 309342277553. The next prime is 309342277679. The reversal of 309342277649 is 946772243903.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 236040505600 + 73301772049 = 485840^2 + 270743^2 .

It is a cyclic number.

It is not a de Polignac number, because 309342277649 - 2²⁰ = 309341229073 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 309342277594 and 309342277603.

It is not a weakly prime, because it can be changed into another prime (309342277679) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 154671138824 + 154671138825.

It is an arithmetic number, because the mean of its divisors is an integer number (154671138825).

Almost surely, 2^309342277649 is an apocalyptic number.

It is an amenable number.

309342277649 is a deficient number, since it is larger than the sum of its proper divisors (1).

309342277649 is an equidigital number, since it uses as much as digits as its factorization.

309342277649 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 13716864, while the sum is 56.

The spelling of 309342277649 in words is "three hundred nine billion, three hundred forty-two million, two hundred seventy-seven thousand, six hundred forty-nine".