1238136569 has 2 divisors, whose sum is σ = 1238136570. Its totient is φ = 1238136568.

The previous prime is 1238136563. The next prime is 1238136619. The reversal of 1238136569 is 9656318321.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 636906169 + 601230400 = 25237^2 + 24520^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1238136569 is a prime.

It is a super-2 number, since 2×1238136569² = 3065964326990183522, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (1238136563) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 619068284 + 619068285.

It is an arithmetic number, because the mean of its divisors is an integer number (619068285).

Almost surely, 2^1238136569 is an apocalyptic number.

It is an amenable number.

1238136569 is a deficient number, since it is larger than the sum of its proper divisors (1).

1238136569 is an equidigital number, since it uses as much as digits as its factorization.

1238136569 is an evil number, because the sum of its binary digits is even.

The product of its digits is 233280, while the sum is 44.

The square root of 1238136569 is about 35187.1648332172. The cubic root of 1238136569 is about 1073.7986417783.

The spelling of 1238136569 in words is "one billion, two hundred thirty-eight million, one hundred thirty-six thousand, five hundred sixty-nine".