2156736947 has 2 divisors, whose sum is σ = 2156736948. Its totient is φ = 2156736946.

The previous prime is 2156736941. The next prime is 2156736973. The reversal of 2156736947 is 7496376512.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 2156736947 - 2²⁰ = 2155688371 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 2156736895 and 2156736904.

It is not a weakly prime, because it can be changed into another prime (2156736941) 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, 1078368473 + 1078368474.

It is an arithmetic number, because the mean of its divisors is an integer number (1078368474).

Almost surely, 2^2156736947 is an apocalyptic number.

2156736947 is a deficient number, since it is larger than the sum of its proper divisors (1).

2156736947 is an equidigital number, since it uses as much as digits as its factorization.

2156736947 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 1905120, while the sum is 50.

The square root of 2156736947 is about 46440.6820255689. The cubic root of 2156736947 is about 1292.0095568358.

The spelling of 2156736947 in words is "two billion, one hundred fifty-six million, seven hundred thirty-six thousand, nine hundred forty-seven".