2156647439 has 2 divisors, whose sum is σ = 2156647440. Its totient is φ = 2156647438.

The previous prime is 2156647391. The next prime is 2156647469. The reversal of 2156647439 is 9347466512.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-2156647439 is a prime.

It is a super-2 number, since 2×2156647439² = 9302256352290517442, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 2156647393 and 2156647402.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (2156647469) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1078323719 + 1078323720.

It is an arithmetic number, because the mean of its divisors is an integer number (1078323720).

Almost surely, 2^2156647439 is an apocalyptic number.

2156647439 is a deficient number, since it is larger than the sum of its proper divisors (1).

2156647439 is an equidigital number, since it uses as much as digits as its factorization.

2156647439 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 1088640, while the sum is 47.

The square root of 2156647439 is about 46439.7183346325. The cubic root of 2156647439 is about 1291.9916831074.

The spelling of 2156647439 in words is "two billion, one hundred fifty-six million, six hundred forty-seven thousand, four hundred thirty-nine".