51100544981 has 4 divisors (see below), whose sum is σ = 52288929792. Its totient is φ = 49912160172.

The previous prime is 51100544947. The next prime is 51100545017. The reversal of 51100544981 is 18944500115.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 18944500115 = 5 ⋅3788900023.

It is a cyclic number.

It is not a de Polignac number, because 51100544981 - 2⁶ = 51100544917 is a prime.

It is a super-2 number, since 2×51100544981² (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 (51100544921) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 594192341 + ... + 594192426.

It is an arithmetic number, because the mean of its divisors is an integer number (13072232448).

Almost surely, 2^51100544981 is an apocalyptic number.

It is an amenable number.

51100544981 is a deficient number, since it is larger than the sum of its proper divisors (1188384811).

51100544981 is a wasteful number, since it uses less digits than its factorization.

51100544981 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1188384810.

The product of its (nonzero) digits is 28800, while the sum is 38.

The spelling of 51100544981 in words is "fifty-one billion, one hundred million, five hundred forty-four thousand, nine hundred eighty-one".