2551243281 has 8 divisors (see below), whose sum is σ = 3412526880. Its totient is φ = 1695394272.

The previous prime is 2551243273. The next prime is 2551243291. The reversal of 2551243281 is 1823421552.

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

It is not a de Polignac number, because 2551243281 - 2³ = 2551243273 is a prime.

It is a super-2 number, since 2×2551243281² = 13017684557695289922, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (2551243231) 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, 1357551 + ... + 1359428.

It is an arithmetic number, because the mean of its divisors is an integer number (426565860).

Almost surely, 2^2551243281 is an apocalyptic number.

It is an amenable number.

2551243281 is a deficient number, since it is larger than the sum of its proper divisors (861283599).

2551243281 is a wasteful number, since it uses less digits than its factorization.

2551243281 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2717295.

The product of its digits is 19200, while the sum is 33.

The square root of 2551243281 is about 50509.8335079418. The cubic root of 2551243281 is about 1366.4192068778.

The spelling of 2551243281 in words is "two billion, five hundred fifty-one million, two hundred forty-three thousand, two hundred eighty-one".