494209251 has 24 divisors (see below), whose sum is σ = 728914160. Its totient is φ = 322574400.

The previous prime is 494209241. The next prime is 494209267. The reversal of 494209251 is 152902494.

It is not a de Polignac number, because 494209251 - 2⁷ = 494209123 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (494209231) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 123756 + ... + 127686.

Almost surely, 2^494209251 is an apocalyptic number.

494209251 is a deficient number, since it is larger than the sum of its proper divisors (234704909).

494209251 is a wasteful number, since it uses less digits than its factorization.

494209251 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4227 (or 4224 counting only the distinct ones).

The product of its (nonzero) digits is 25920, while the sum is 36.

The square root of 494209251 is about 22230.8175963009. The cubic root of 494209251 is about 790.6245400509.

The spelling of 494209251 in words is "four hundred ninety-four million, two hundred nine thousand, two hundred fifty-one".