1537138643 has 2 divisors, whose sum is σ = 1537138644. Its totient is φ = 1537138642.

The previous prime is 1537138633. The next prime is 1537138709. The reversal of 1537138643 is 3468317351.

It is a happy number.

It is a weak prime.

It is an emirp because it is prime and its reverse (3468317351) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 1537138643 - 2⁶ = 1537138579 is a prime.

It is a Sophie Germain prime.

It is a self number, because there is not a number n which added to its sum of digits gives 1537138643.

It is not a weakly prime, because it can be changed into another prime (1537138613) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 768569321 + 768569322.

It is an arithmetic number, because the mean of its divisors is an integer number (768569322).

Almost surely, 2^1537138643 is an apocalyptic number.

1537138643 is a deficient number, since it is larger than the sum of its proper divisors (1).

1537138643 is an equidigital number, since it uses as much as digits as its factorization.

1537138643 is an evil number, because the sum of its binary digits is even.

The product of its digits is 181440, while the sum is 41.

The square root of 1537138643 is about 39206.3597264525. The cubic root of 1537138643 is about 1154.0846912725.

The spelling of 1537138643 in words is "one billion, five hundred thirty-seven million, one hundred thirty-eight thousand, six hundred forty-three".