2551963281 has 8 divisors (see below), whose sum is σ = 3888705984. Its totient is φ = 1458264720.

The previous prime is 2551963261. The next prime is 2551963319. The reversal of 2551963281 is 1823691552.

2551963281 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 2551963281 - 2⁶ = 2551963217 is a prime.

It is a super-2 number, since 2×2551963281² = 13025033175144569922, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (2551963241) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 60761010 + ... + 60761051.

It is an arithmetic number, because the mean of its divisors is an integer number (486088248).

Almost surely, 2^2551963281 is an apocalyptic number.

2551963281 is a gapful number since it is divisible by the number (21) formed by its first and last digit.

It is an amenable number.

2551963281 is a deficient number, since it is larger than the sum of its proper divisors (1336742703).

2551963281 is a wasteful number, since it uses less digits than its factorization.

2551963281 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 121522071.

The product of its digits is 129600, while the sum is 42.

The square root of 2551963281 is about 50516.9603301703. The cubic root of 2551963281 is about 1366.5477362764.

The spelling of 2551963281 in words is "two billion, five hundred fifty-one million, nine hundred sixty-three thousand, two hundred eighty-one".