2156736973 has 2 divisors, whose sum is σ = 2156736974. Its totient is φ = 2156736972.

The previous prime is 2156736947. The next prime is 2156736983. The reversal of 2156736973 is 3796376512.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1295784009 + 860952964 = 35997^2 + 29342^2 .

It is a cyclic number.

It is not a de Polignac number, because 2156736973 - 2⁵ = 2156736941 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (2156736983) 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, 1078368486 + 1078368487.

It is an arithmetic number, because the mean of its divisors is an integer number (1078368487).

Almost surely, 2^2156736973 is an apocalyptic number.

It is an amenable number.

2156736973 is a deficient number, since it is larger than the sum of its proper divisors (1).

2156736973 is an equidigital number, since it uses as much as digits as its factorization.

2156736973 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 1428840, while the sum is 49.

The square root of 2156736973 is about 46440.6823054959. The cubic root of 2156736973 is about 1292.0095620277.

The spelling of 2156736973 in words is "two billion, one hundred fifty-six million, seven hundred thirty-six thousand, nine hundred seventy-three".