318729641 has 8 divisors (see below), whose sum is σ = 321488160. Its totient is φ = 315978048.

The previous prime is 318729629. The next prime is 318729647. The reversal of 318729641 is 146927813.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 318729641 - 2⁶ = 318729577 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (318729647) 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 in 7 ways as a sum of consecutive naturals, for example, 134630 + ... + 136976.

It is an arithmetic number, because the mean of its divisors is an integer number (40186020).

Almost surely, 2^318729641 is an apocalyptic number.

It is an amenable number.

318729641 is a deficient number, since it is larger than the sum of its proper divisors (2758519).

318729641 is a wasteful number, since it uses less digits than its factorization.

318729641 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3463.

The product of its digits is 72576, while the sum is 41.

The square root of 318729641 is about 17853.0008962079. Note that the first 3 decimals coincide. The cubic root of 318729641 is about 683.0840602322.

The spelling of 318729641 in words is "three hundred eighteen million, seven hundred twenty-nine thousand, six hundred forty-one".