51530443251 has 24 divisors (see below), whose sum is σ = 80748758160. Its totient is φ = 29142392832.

The previous prime is 51530443171. The next prime is 51530443303. The reversal of 51530443251 is 15234403515.

It is not a de Polignac number, because 51530443251 - 2¹¹ = 51530441203 is a prime.

It is not an unprimeable number, because it can be changed into a prime (51530443051) 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, 1792686 + ... + 1821203.

It is an arithmetic number, because the mean of its divisors is an integer number (3364531590).

Almost surely, 2^51530443251 is an apocalyptic number.

51530443251 is a deficient number, since it is larger than the sum of its proper divisors (29218314909).

51530443251 is a wasteful number, since it uses less digits than its factorization.

51530443251 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3614003 (or 3613996 counting only the distinct ones).

The product of its (nonzero) digits is 36000, while the sum is 33.

Adding to 51530443251 its reverse (15234403515), we get a palindrome (66764846766).

The spelling of 51530443251 in words is "fifty-one billion, five hundred thirty million, four hundred forty-three thousand, two hundred fifty-one".