188388117389 has 2 divisors, whose sum is σ = 188388117390. Its totient is φ = 188388117388.

The previous prime is 188388117367. The next prime is 188388117403. The reversal of 188388117389 is 983711883881.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 145205199364 + 43182918025 = 381058^2 + 207805^2 .

It is an emirp because it is prime and its reverse (983711883881) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 188388117389 - 2¹² = 188388113293 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (188388137389) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 94194058694 + 94194058695.

It is an arithmetic number, because the mean of its divisors is an integer number (94194058695).

Almost surely, 2^188388117389 is an apocalyptic number.

It is an amenable number.

188388117389 is a deficient number, since it is larger than the sum of its proper divisors (1).

188388117389 is an equidigital number, since it uses as much as digits as its factorization.

188388117389 is an evil number, because the sum of its binary digits is even.

The product of its digits is 18579456, while the sum is 65.

The spelling of 188388117389 in words is "one hundred eighty-eight billion, three hundred eighty-eight million, one hundred seventeen thousand, three hundred eighty-nine".