2256720937 has 2 divisors, whose sum is σ = 2256720938. Its totient is φ = 2256720936.

The previous prime is 2256720911. The next prime is 2256720941. The reversal of 2256720937 is 7390276522.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1817231641 + 439489296 = 42629^2 + 20964^2 .

It is a cyclic number.

It is not a de Polignac number, because 2256720937 - 2¹¹ = 2256718889 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 2256720893 and 2256720902.

It is not a weakly prime, because it can be changed into another prime (2256720737) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1128360468 + 1128360469.

It is an arithmetic number, because the mean of its divisors is an integer number (1128360469).

Almost surely, 2^2256720937 is an apocalyptic number.

It is an amenable number.

2256720937 is a deficient number, since it is larger than the sum of its proper divisors (1).

2256720937 is an equidigital number, since it uses as much as digits as its factorization.

2256720937 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 317520, while the sum is 43.

The square root of 2256720937 is about 47504.9569729307. The cubic root of 2256720937 is about 1311.6741288712.

The spelling of 2256720937 in words is "two billion, two hundred fifty-six million, seven hundred twenty thousand, nine hundred thirty-seven".