51121233913 has 2 divisors, whose sum is σ = 51121233914. Its totient is φ = 51121233912.

The previous prime is 51121233881. The next prime is 51121234033. The reversal of 51121233913 is 31933212115.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 35348888169 + 15772345744 = 188013^2 + 125588^2 .

It is a cyclic number.

It is not a de Polignac number, because 51121233913 - 2⁵ = 51121233881 is a prime.

It is a super-2 number, since 2×51121233913² (a number of 22 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (51121239913) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 25560616956 + 25560616957.

It is an arithmetic number, because the mean of its divisors is an integer number (25560616957).

Almost surely, 2^51121233913 is an apocalyptic number.

It is an amenable number.

51121233913 is a deficient number, since it is larger than the sum of its proper divisors (1).

51121233913 is an equidigital number, since it uses as much as digits as its factorization.

51121233913 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 4860, while the sum is 31.

The spelling of 51121233913 in words is "fifty-one billion, one hundred twenty-one million, two hundred thirty-three thousand, nine hundred thirteen".