2255529721 has 2 divisors, whose sum is σ = 2255529722. Its totient is φ = 2255529720.

The previous prime is 2255529701. The next prime is 2255529737. The reversal of 2255529721 is 1279255522.

2255529721 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1495755625 + 759774096 = 38675^2 + 27564^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-2255529721 is a prime.

It is not a weakly prime, because it can be changed into another prime (2255529701) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1127764860 + 1127764861.

It is an arithmetic number, because the mean of its divisors is an integer number (1127764861).

Almost surely, 2^2255529721 is an apocalyptic number.

It is an amenable number.

2255529721 is a deficient number, since it is larger than the sum of its proper divisors (1).

2255529721 is an equidigital number, since it uses as much as digits as its factorization.

2255529721 is an evil number, because the sum of its binary digits is even.

The product of its digits is 126000, while the sum is 40.

The square root of 2255529721 is about 47492.4175105879. The cubic root of 2255529721 is about 1311.4432980545.

The spelling of 2255529721 in words is "two billion, two hundred fifty-five million, five hundred twenty-nine thousand, seven hundred twenty-one".