491993599 has 2 divisors, whose sum is σ = 491993600. Its totient is φ = 491993598.

The previous prime is 491993533. The next prime is 491993633. The reversal of 491993599 is 995399194.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-491993599 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (491993899) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 245996799 + 245996800.

It is an arithmetic number, because the mean of its divisors is an integer number (245996800).

Almost surely, 2^491993599 is an apocalyptic number.

491993599 is a deficient number, since it is larger than the sum of its proper divisors (1).

491993599 is an equidigital number, since it uses as much as digits as its factorization.

491993599 is an evil number, because the sum of its binary digits is even.

The product of its digits is 3542940, while the sum is 58.

The square root of 491993599 is about 22180.9287226662. The cubic root of 491993599 is about 789.4412536808.

The spelling of 491993599 in words is "four hundred ninety-one million, nine hundred ninety-three thousand, five hundred ninety-nine".