51162791213 has 2 divisors, whose sum is σ = 51162791214. Its totient is φ = 51162791212.

The previous prime is 51162791131. The next prime is 51162791231. The reversal of 51162791213 is 31219726115.

Together with next prime (51162791231) it forms an Ormiston pair, because they use the same digits, order apart.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 37103234884 + 14059556329 = 192622^2 + 118573^2 .

It is a cyclic number.

It is not a de Polignac number, because 51162791213 - 2³² = 46867823917 is a prime.

It is a super-2 number, since 2×51162791213² (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 (51162791293) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 25581395606 + 25581395607.

It is an arithmetic number, because the mean of its divisors is an integer number (25581395607).

Almost surely, 2^51162791213 is an apocalyptic number.

It is an amenable number.

51162791213 is a deficient number, since it is larger than the sum of its proper divisors (1).

51162791213 is an equidigital number, since it uses as much as digits as its factorization.

51162791213 is an evil number, because the sum of its binary digits is even.

The product of its digits is 22680, while the sum is 38.

The spelling of 51162791213 in words is "fifty-one billion, one hundred sixty-two million, seven hundred ninety-one thousand, two hundred thirteen".