331646385 has 16 divisors (see below), whose sum is σ = 606439296. Its totient is φ = 151609728.

The previous prime is 331646369. The next prime is 331646411. The reversal of 331646385 is 583646133.

It is not a de Polignac number, because 331646385 - 2⁴ = 331646369 is a prime.

It is an unprimeable number.

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 15 ways as a sum of consecutive naturals, for example, 1579164 + ... + 1579373.

It is an arithmetic number, because the mean of its divisors is an integer number (37902456).

Almost surely, 2^331646385 is an apocalyptic number.

331646385 is a gapful number since it is divisible by the number (35) formed by its first and last digit.

It is an amenable number.

331646385 is a deficient number, since it is larger than the sum of its proper divisors (274792911).

331646385 is a wasteful number, since it uses less digits than its factorization.

331646385 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3158552.

The product of its digits is 155520, while the sum is 39.

The square root of 331646385 is about 18211.1610008808. The cubic root of 331646385 is about 692.1896309741.

The spelling of 331646385 in words is "three hundred thirty-one million, six hundred forty-six thousand, three hundred eighty-five".