42723137129 has 2 divisors, whose sum is σ = 42723137130. Its totient is φ = 42723137128.

The previous prime is 42723137047. The next prime is 42723137137. The reversal of 42723137129 is 92173132724.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 39711322729 + 3011814400 = 199277^2 + 54880^2 .

It is a cyclic number.

It is not a de Polignac number, because 42723137129 - 2³² = 38428169833 is a prime.

It is a super-2 number, since 2×42723137129² (a number of 22 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (42723137159) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 21361568564 + 21361568565.

It is an arithmetic number, because the mean of its divisors is an integer number (21361568565).

Almost surely, 2^42723137129 is an apocalyptic number.

It is an amenable number.

42723137129 is a deficient number, since it is larger than the sum of its proper divisors (1).

42723137129 is an equidigital number, since it uses as much as digits as its factorization.

42723137129 is an evil number, because the sum of its binary digits is even.

The product of its digits is 127008, while the sum is 41.

The spelling of 42723137129 in words is "forty-two billion, seven hundred twenty-three million, one hundred thirty-seven thousand, one hundred twenty-nine".