51131219791 has 8 divisors (see below), whose sum is σ = 51192440624. Its totient is φ = 51070029120.

The previous prime is 51131219773. The next prime is 51131219813. The reversal of 51131219791 is 19791213115.

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 51131219791 - 2¹¹ = 51131217743 is a prime.

It is a super-2 number, since 2×51131219791² (a number of 22 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (51131219701) 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, 5831851 + ... + 5840611.

It is an arithmetic number, because the mean of its divisors is an integer number (6399055078).

Almost surely, 2^51131219791 is an apocalyptic number.

51131219791 is a deficient number, since it is larger than the sum of its proper divisors (61220833).

51131219791 is a wasteful number, since it uses less digits than its factorization.

51131219791 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 15081.

The product of its digits is 17010, while the sum is 40.

The spelling of 51131219791 in words is "fifty-one billion, one hundred thirty-one million, two hundred nineteen thousand, seven hundred ninety-one".