71378137 has 2 divisors, whose sum is σ = 71378138. Its totient is φ = 71378136.

The previous prime is 71378093. The next prime is 71378147. The reversal of 71378137 is 73187317.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 70829056 + 549081 = 8416^2 + 741^2 .

It is a cyclic number.

It is not a de Polignac number, because 71378137 - 2¹¹ = 71376089 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 71378096 and 71378105.

It is not a weakly prime, because it can be changed into another prime (71378147) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 35689068 + 35689069.

It is an arithmetic number, because the mean of its divisors is an integer number (35689069).

Almost surely, 2^71378137 is an apocalyptic number.

It is an amenable number.

71378137 is a deficient number, since it is larger than the sum of its proper divisors (1).

71378137 is an equidigital number, since it uses as much as digits as its factorization.

71378137 is an evil number, because the sum of its binary digits is even.

The product of its digits is 24696, while the sum is 37.

The square root of 71378137 is about 8448.5582793752. The cubic root of 71378137 is about 414.8155894271.

The spelling of 71378137 in words is "seventy-one million, three hundred seventy-eight thousand, one hundred thirty-seven".