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494478581 = 4003123527
BaseRepresentation
bin11101011110010…
…010010011110101
31021110110010002112
4131132102103311
52003041303311
6121022220405
715152666342
oct3536222365
91243403075
10494478581
11234136093
12119724705
137b5a0b9c
14499597c9
152d62728b
hex1d7924f5

494478581 has 4 divisors (see below), whose sum is σ = 494606112. Its totient is φ = 494351052.

The previous prime is 494478557. The next prime is 494478631. The reversal of 494478581 is 185874494.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2k-494478581 is a prime.

It is a super-2 number, since 2×4944785812 = 489018134135547122, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (494478511) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 57761 + ... + 65766.

It is an arithmetic number, because the mean of its divisors is an integer number (123651528).

Almost surely, 2494478581 is an apocalyptic number.

It is an amenable number.

494478581 is a deficient number, since it is larger than the sum of its proper divisors (127531).

494478581 is a wasteful number, since it uses less digits than its factorization.

494478581 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 127530.

The product of its digits is 1290240, while the sum is 50.

The square root of 494478581 is about 22236.8743531999. The cubic root of 494478581 is about 790.7681366055.

The spelling of 494478581 in words is "four hundred ninety-four million, four hundred seventy-eight thousand, five hundred eighty-one".

Divisors: 1 4003 123527 494478581