494347991 has 2 divisors, whose sum is σ = 494347992. Its totient is φ = 494347990.

The previous prime is 494347963. The next prime is 494348011. The reversal of 494347991 is 199743494.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 494347991 - 2²² = 490153687 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (494347921) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 247173995 + 247173996.

It is an arithmetic number, because the mean of its divisors is an integer number (247173996).

Almost surely, 2^494347991 is an apocalyptic number.

494347991 is a deficient number, since it is larger than the sum of its proper divisors (1).

494347991 is an equidigital number, since it uses as much as digits as its factorization.

494347991 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 979776, while the sum is 50.

The square root of 494347991 is about 22233.9378203682. The cubic root of 494347991 is about 790.6985174774.

The spelling of 494347991 in words is "four hundred ninety-four million, three hundred forty-seven thousand, nine hundred ninety-one".