38849021969 has 2 divisors, whose sum is σ = 38849021970. Its totient is φ = 38849021968.

The previous prime is 38849021923. The next prime is 38849021971. The reversal of 38849021969 is 96912094883.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 30385021969 + 8464000000 = 174313^2 + 92000^2 .

It is a cyclic number.

It is not a de Polignac number, because 38849021969 - 2⁸ = 38849021713 is a prime.

It is a super-2 number, since 2×38849021969² (a number of 22 digits) contains 22 as substring.

It is a Sophie Germain prime.

Together with 38849021971, it forms a pair of twin primes.

It is a Chen prime.

It is a Curzon number.

It is not a weakly prime, because it can be changed into another prime (38849021069) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 19424510984 + 19424510985.

It is an arithmetic number, because the mean of its divisors is an integer number (19424510985).

Almost surely, 2^38849021969 is an apocalyptic number.

It is an amenable number.

38849021969 is a deficient number, since it is larger than the sum of its proper divisors (1).

38849021969 is an equidigital number, since it uses as much as digits as its factorization.

38849021969 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 6718464, while the sum is 59.

The spelling of 38849021969 in words is "thirty-eight billion, eight hundred forty-nine million, twenty-one thousand, nine hundred sixty-nine".