51138167429 has 2 divisors, whose sum is σ = 51138167430. Its totient is φ = 51138167428.

The previous prime is 51138167387. The next prime is 51138167447. The reversal of 51138167429 is 92476183115.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 48900688225 + 2237479204 = 221135^2 + 47302^2 .

It is a cyclic number.

It is not a de Polignac number, because 51138167429 - 2¹² = 51138163333 is a prime.

It is a super-2 number, since 2×51138167429² (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 (51138067429) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 25569083714 + 25569083715.

It is an arithmetic number, because the mean of its divisors is an integer number (25569083715).

Almost surely, 2^51138167429 is an apocalyptic number.

It is an amenable number.

51138167429 is a deficient number, since it is larger than the sum of its proper divisors (1).

51138167429 is an equidigital number, since it uses as much as digits as its factorization.

51138167429 is an evil number, because the sum of its binary digits is even.

The product of its digits is 362880, while the sum is 47.

The spelling of 51138167429 in words is "fifty-one billion, one hundred thirty-eight million, one hundred sixty-seven thousand, four hundred twenty-nine".