328949521 has 2 divisors, whose sum is σ = 328949522. Its totient is φ = 328949520.

The previous prime is 328949513. The next prime is 328949531. The reversal of 328949521 is 125949823.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 188787600 + 140161921 = 13740^2 + 11839^2 .

It is an emirp because it is prime and its reverse (125949823) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 328949521 - 2³ = 328949513 is a prime.

It is a super-2 number, since 2×328949521² = 216415574732258882, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (328949531) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 164474760 + 164474761.

It is an arithmetic number, because the mean of its divisors is an integer number (164474761).

Almost surely, 2^328949521 is an apocalyptic number.

It is an amenable number.

328949521 is a deficient number, since it is larger than the sum of its proper divisors (1).

328949521 is an equidigital number, since it uses as much as digits as its factorization.

328949521 is an evil number, because the sum of its binary digits is even.

The product of its digits is 155520, while the sum is 43.

The square root of 328949521 is about 18136.9655951595. The cubic root of 328949521 is about 690.3082855408.

The spelling of 328949521 in words is "three hundred twenty-eight million, nine hundred forty-nine thousand, five hundred twenty-one".