331728413 has 2 divisors, whose sum is σ = 331728414. Its totient is φ = 331728412.

The previous prime is 331728409. The next prime is 331728469. The reversal of 331728413 is 314827133.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 290293444 + 41434969 = 17038^2 + 6437^2 .

It is a cyclic number.

It is not a de Polignac number, because 331728413 - 2² = 331728409 is a prime.

It is a super-2 number, since 2×331728413² = 220087479982997138, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 331728413.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (331728403) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 165864206 + 165864207.

It is an arithmetic number, because the mean of its divisors is an integer number (165864207).

Almost surely, 2^331728413 is an apocalyptic number.

It is an amenable number.

331728413 is a deficient number, since it is larger than the sum of its proper divisors (1).

331728413 is an equidigital number, since it uses as much as digits as its factorization.

331728413 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 12096, while the sum is 32.

The square root of 331728413 is about 18213.4129970195. The cubic root of 331728413 is about 692.2466940119.

The spelling of 331728413 in words is "three hundred thirty-one million, seven hundred twenty-eight thousand, four hundred thirteen".