1537138709 has 2 divisors, whose sum is σ = 1537138710. Its totient is φ = 1537138708.

The previous prime is 1537138643. The next prime is 1537138721. The reversal of 1537138709 is 9078317351.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1517336209 + 19802500 = 38953^2 + 4450^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1537138709 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 1537138709.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1537138739) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 768569354 + 768569355.

It is an arithmetic number, because the mean of its divisors is an integer number (768569355).

Almost surely, 2^1537138709 is an apocalyptic number.

It is an amenable number.

1537138709 is a deficient number, since it is larger than the sum of its proper divisors (1).

1537138709 is an equidigital number, since it uses as much as digits as its factorization.

1537138709 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 158760, while the sum is 44.

The square root of 1537138709 is about 39206.3605681527. The cubic root of 1537138709 is about 1154.0847077901.

The spelling of 1537138709 in words is "one billion, five hundred thirty-seven million, one hundred thirty-eight thousand, seven hundred nine".