71109278137 has 2 divisors, whose sum is σ = 71109278138. Its totient is φ = 71109278136.

The previous prime is 71109278057. The next prime is 71109278143. The reversal of 71109278137 is 73187290117.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 70758128016 + 351150121 = 266004^2 + 18739^2 .

It is a cyclic number.

It is not a de Polignac number, because 71109278137 - 2¹¹ = 71109276089 is a prime.

It is not a weakly prime, because it can be changed into another prime (71109278197) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 35554639068 + 35554639069.

It is an arithmetic number, because the mean of its divisors is an integer number (35554639069).

Almost surely, 2^71109278137 is an apocalyptic number.

It is an amenable number.

71109278137 is a deficient number, since it is larger than the sum of its proper divisors (1).

71109278137 is an equidigital number, since it uses as much as digits as its factorization.

71109278137 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 148176, while the sum is 46.

The spelling of 71109278137 in words is "seventy-one billion, one hundred nine million, two hundred seventy-eight thousand, one hundred thirty-seven".