938989691 has 2 divisors, whose sum is σ = 938989692. Its totient is φ = 938989690.

The previous prime is 938989673. The next prime is 938989703. The reversal of 938989691 is 196989839.

It is a strong prime.

It is an emirp because it is prime and its reverse (196989839) is a distict prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-938989691 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (938989591) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 469494845 + 469494846.

It is an arithmetic number, because the mean of its divisors is an integer number (469494846).

Almost surely, 2^938989691 is an apocalyptic number.

938989691 is a deficient number, since it is larger than the sum of its proper divisors (1).

938989691 is an equidigital number, since it uses as much as digits as its factorization.

938989691 is an evil number, because the sum of its binary digits is even.

The product of its digits is 7558272, while the sum is 62.

The square root of 938989691 is about 30642.9386808772. The cubic root of 938989691 is about 979.2350308986.

The spelling of 938989691 in words is "nine hundred thirty-eight million, nine hundred eighty-nine thousand, six hundred ninety-one".