51127881829 has 2 divisors, whose sum is σ = 51127881830. Its totient is φ = 51127881828.

The previous prime is 51127881821. The next prime is 51127881859. The reversal of 51127881829 is 92818872115.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 43524390625 + 7603491204 = 208625^2 + 87198^2 .

It is a cyclic number.

It is not a de Polignac number, because 51127881829 - 2³ = 51127881821 is a prime.

It is a super-2 number, since 2×51127881829² (a number of 22 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (51127881821) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 25563940914 + 25563940915.

It is an arithmetic number, because the mean of its divisors is an integer number (25563940915).

Almost surely, 2^51127881829 is an apocalyptic number.

It is an amenable number.

51127881829 is a deficient number, since it is larger than the sum of its proper divisors (1).

51127881829 is an equidigital number, since it uses as much as digits as its factorization.

51127881829 is an evil number, because the sum of its binary digits is even.

The product of its digits is 645120, while the sum is 52.

The spelling of 51127881829 in words is "fifty-one billion, one hundred twenty-seven million, eight hundred eighty-one thousand, eight hundred twenty-nine".