8138507437 has 2 divisors, whose sum is σ = 8138507438. Its totient is φ = 8138507436.

The previous prime is 8138507417. The next prime is 8138507449. The reversal of 8138507437 is 7347058318.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 4692113001 + 3446394436 = 68499^2 + 58706^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-8138507437 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (8138507417) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 4069253718 + 4069253719.

It is an arithmetic number, because the mean of its divisors is an integer number (4069253719).

Almost surely, 2^8138507437 is an apocalyptic number.

It is an amenable number.

8138507437 is a deficient number, since it is larger than the sum of its proper divisors (1).

8138507437 is an equidigital number, since it uses as much as digits as its factorization.

8138507437 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 564480, while the sum is 46.

The square root of 8138507437 is about 90213.6765518400. The cubic root of 8138507437 is about 2011.4763076403.

The spelling of 8138507437 in words is "eight billion, one hundred thirty-eight million, five hundred seven thousand, four hundred thirty-seven".