1606731321 has 8 divisors (see below), whose sum is σ = 2307101440. Its totient is φ = 988757712.

The previous prime is 1606731317. The next prime is 1606731323. The reversal of 1606731321 is 1231376061.

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

It is not a de Polignac number, because 1606731321 - 2² = 1606731317 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1606731323) 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 7 ways as a sum of consecutive naturals, for example, 20599081 + ... + 20599158.

It is an arithmetic number, because the mean of its divisors is an integer number (288387680).

Almost surely, 2^1606731321 is an apocalyptic number.

It is an amenable number.

1606731321 is a deficient number, since it is larger than the sum of its proper divisors (700370119).

1606731321 is a wasteful number, since it uses less digits than its factorization.

1606731321 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 41198255.

The product of its (nonzero) digits is 4536, while the sum is 30.

The square root of 1606731321 is about 40084.0532007431. The cubic root of 1606731321 is about 1171.2450089863.

The spelling of 1606731321 in words is "one billion, six hundred six million, seven hundred thirty-one thousand, three hundred twenty-one".