51891145181 has 8 divisors (see below), whose sum is σ = 54832692480. Its totient is φ = 49006715472.

The previous prime is 51891145169. The next prime is 51891145211. The reversal of 51891145181 is 18154119815.

It is a happy number.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-51891145181 is a prime.

It is a super-2 number, since 2×51891145181² (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 (51891148181) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 14277530 + ... + 14281163.

It is an arithmetic number, because the mean of its divisors is an integer number (6854086560).

Almost surely, 2^51891145181 is an apocalyptic number.

It is an amenable number.

51891145181 is a deficient number, since it is larger than the sum of its proper divisors (2941547299).

51891145181 is a wasteful number, since it uses less digits than its factorization.

51891145181 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 28558795.

The product of its digits is 57600, while the sum is 44.

The spelling of 51891145181 in words is "fifty-one billion, eight hundred ninety-one million, one hundred forty-five thousand, one hundred eighty-one".