331026385 has 4 divisors (see below), whose sum is σ = 397231668. Its totient is φ = 264821104.

The previous prime is 331026359. The next prime is 331026391. The reversal of 331026385 is 583620133.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 583620133 = 2957 ⋅197369.

It can be written as a sum of positive squares in 2 ways, for example, as 206324496 + 124701889 = 14364^2 + 11167^2 .

It is a cyclic number.

It is not a de Polignac number, because 331026385 - 2¹⁹ = 330502097 is a prime.

It is a Duffinian number.

It is an unprimeable number.

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, 33102634 + ... + 33102643.

It is an arithmetic number, because the mean of its divisors is an integer number (99307917).

Almost surely, 2^331026385 is an apocalyptic number.

It is an amenable number.

331026385 is a deficient number, since it is larger than the sum of its proper divisors (66205283).

331026385 is an equidigital number, since it uses as much as digits as its factorization.

331026385 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 66205282.

The product of its (nonzero) digits is 12960, while the sum is 31.

The square root of 331026385 is about 18194.1305095902. The cubic root of 331026385 is about 691.7580213845.

The spelling of 331026385 in words is "three hundred thirty-one million, twenty-six thousand, three hundred eighty-five".