2551022281 has 4 divisors (see below), whose sum is σ = 2551508100. Its totient is φ = 2550536464.

The previous prime is 2551022197. The next prime is 2551022293. The reversal of 2551022281 is 1822201552.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 390260025 + 2160762256 = 19755^2 + 46484^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-2551022281 is a prime.

It is a super-2 number, since 2×2551022281² = 13015429356316885922, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (2551026281) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 234946 + ... + 245563.

It is an arithmetic number, because the mean of its divisors is an integer number (637877025).

Almost surely, 2^2551022281 is an apocalyptic number.

It is an amenable number.

2551022281 is a deficient number, since it is larger than the sum of its proper divisors (485819).

2551022281 is an equidigital number, since it uses as much as digits as its factorization.

2551022281 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 485818.

The product of its (nonzero) digits is 3200, while the sum is 28.

The square root of 2551022281 is about 50507.6457677449. The cubic root of 2551022281 is about 1366.3797506426.

The spelling of 2551022281 in words is "two billion, five hundred fifty-one million, twenty-two thousand, two hundred eighty-one".