494931861 has 12 divisors (see below), whose sum is σ = 728390988. Its totient is φ = 323728704.

The previous prime is 494931859. The next prime is 494931887. The reversal of 494931861 is 168139494.

494931861 is a `hidden beast` number, since 494 + 93 + 18 + 61 = 666.

It can be written as a sum of positive squares in 2 ways, for example, as 332369361 + 162562500 = 18231^2 + 12750^2 .

It is not a de Polignac number, because 494931861 - 2¹ = 494931859 is a prime.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (494931821) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 518320 + ... + 519273.

It is an arithmetic number, because the mean of its divisors is an integer number (60699249).

Almost surely, 2^494931861 is an apocalyptic number.

It is an amenable number.

494931861 is a deficient number, since it is larger than the sum of its proper divisors (233459127).

494931861 is a wasteful number, since it uses less digits than its factorization.

494931861 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1037652 (or 1037649 counting only the distinct ones).

The product of its digits is 186624, while the sum is 45.

The square root of 494931861 is about 22247.0640984378. The cubic root of 494931861 is about 791.0096906555.

The spelling of 494931861 in words is "four hundred ninety-four million, nine hundred thirty-one thousand, eight hundred sixty-one".