938997491 has 2 divisors, whose sum is σ = 938997492. Its totient is φ = 938997490.

The previous prime is 938997469. The next prime is 938997497. The reversal of 938997491 is 194799839.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 938997491 - 2⁶ = 938997427 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 938997491.

It is not a weakly prime, because it can be changed into another prime (938997497) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 469498745 + 469498746.

It is an arithmetic number, because the mean of its divisors is an integer number (469498746).

Almost surely, 2^938997491 is an apocalyptic number.

938997491 is a deficient number, since it is larger than the sum of its proper divisors (1).

938997491 is an equidigital number, since it uses as much as digits as its factorization.

938997491 is an evil number, because the sum of its binary digits is even.

The product of its digits is 4408992, while the sum is 59.

The square root of 938997491 is about 30643.0659530015. The cubic root of 938997491 is about 979.2377423278.

The spelling of 938997491 in words is "nine hundred thirty-eight million, nine hundred ninety-seven thousand, four hundred ninety-one".