51124611981 has 8 divisors (see below), whose sum is σ = 68215802400. Its totient is φ = 34058248112.

The previous prime is 51124611971. The next prime is 51124612031. The reversal of 51124611981 is 18911642115.

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 51124611981 - 2⁹ = 51124611469 is a prime.

It is a super-2 number, since 2×51124611981² (a number of 22 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (51124611911) 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, 6201831 + ... + 6210068.

It is an arithmetic number, because the mean of its divisors is an integer number (8526975300).

Almost surely, 2^51124611981 is an apocalyptic number.

It is an amenable number.

51124611981 is a deficient number, since it is larger than the sum of its proper divisors (17091190419).

51124611981 is a wasteful number, since it uses less digits than its factorization.

51124611981 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12413275.

The product of its digits is 17280, while the sum is 39.

The spelling of 51124611981 in words is "fifty-one billion, one hundred twenty-four million, six hundred eleven thousand, nine hundred eighty-one".