2947397309 has 2 divisors, whose sum is σ = 2947397310. Its totient is φ = 2947397308.

The previous prime is 2947397291. The next prime is 2947397311. The reversal of 2947397309 is 9037937492.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 2630664100 + 316733209 = 51290^2 + 17797^2 .

It is a cyclic number.

It is not a de Polignac number, because 2947397309 - 2²⁰ = 2946348733 is a prime.

Together with 2947397311, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (2947397009) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1473698654 + 1473698655.

It is an arithmetic number, because the mean of its divisors is an integer number (1473698655).

Almost surely, 2^2947397309 is an apocalyptic number.

It is an amenable number.

2947397309 is a deficient number, since it is larger than the sum of its proper divisors (1).

2947397309 is an equidigital number, since it uses as much as digits as its factorization.

2947397309 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 2571912, while the sum is 53.

The square root of 2947397309 is about 54289.9374562174. The cubic root of 2947397309 is about 1433.7702372393.

The spelling of 2947397309 in words is "two billion, nine hundred forty-seven million, three hundred ninety-seven thousand, three hundred nine".