51214689281 has 24 divisors (see below), whose sum is σ = 60645195072. Its totient is φ = 42366261600.

The previous prime is 51214689257. The next prime is 51214689287. The reversal of 51214689281 is 18298641215.

It is a de Polignac number, because none of the positive numbers 2^k-51214689281 is a prime.

It is a super-2 number, since 2×51214689281² (a number of 22 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (51214689287) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 2498966 + ... + 2519376.

It is an arithmetic number, because the mean of its divisors is an integer number (2526883128).

Almost surely, 2^51214689281 is an apocalyptic number.

It is an amenable number.

51214689281 is a deficient number, since it is larger than the sum of its proper divisors (9430505791).

51214689281 is a wasteful number, since it uses less digits than its factorization.

51214689281 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 20853 (or 20822 counting only the distinct ones).

The product of its digits is 276480, while the sum is 47.

The spelling of 51214689281 in words is "fifty-one billion, two hundred fourteen million, six hundred eighty-nine thousand, two hundred eighty-one".