238781187793 has 2 divisors, whose sum is σ = 238781187794. Its totient is φ = 238781187792.

The previous prime is 238781187781. The next prime is 238781187839. The reversal of 238781187793 is 397781187832.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 232163039889 + 6618147904 = 481833^2 + 81352^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-238781187793 is a prime.

It is not a weakly prime, because it can be changed into another prime (238781187703) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 119390593896 + 119390593897.

It is an arithmetic number, because the mean of its divisors is an integer number (119390593897).

Almost surely, 2^238781187793 is an apocalyptic number.

It is an amenable number.

238781187793 is a deficient number, since it is larger than the sum of its proper divisors (1).

238781187793 is an equidigital number, since it uses as much as digits as its factorization.

238781187793 is an evil number, because the sum of its binary digits is even.

The product of its digits is 28449792, while the sum is 64.

The spelling of 238781187793 in words is "two hundred thirty-eight billion, seven hundred eighty-one million, one hundred eighty-seven thousand, seven hundred ninety-three".