51031120251 has 8 divisors (see below), whose sum is σ = 72043934544. Its totient is φ = 32019526400.

The previous prime is 51031120243. The next prime is 51031120291. The reversal of 51031120251 is 15202113015.

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

It is a cyclic number.

It is not a de Polignac number, because 51031120251 - 2³ = 51031120243 is a prime.

It is not an unprimeable number, because it can be changed into a prime (51031120291) 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, 500305050 + ... + 500305151.

It is an arithmetic number, because the mean of its divisors is an integer number (9005491818).

Almost surely, 2^51031120251 is an apocalyptic number.

51031120251 is a gapful number since it is divisible by the number (51) formed by its first and last digit.

51031120251 is a deficient number, since it is larger than the sum of its proper divisors (21012814293).

51031120251 is a wasteful number, since it uses less digits than its factorization.

51031120251 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1000610221.

The product of its (nonzero) digits is 300, while the sum is 21.

Adding to 51031120251 its reverse (15202113015), we get a palindrome (66233233266).

The spelling of 51031120251 in words is "fifty-one billion, thirty-one million, one hundred twenty thousand, two hundred fifty-one".