328277561 has 2 divisors, whose sum is σ = 328277562. Its totient is φ = 328277560.

The previous prime is 328277527. The next prime is 328277567. The reversal of 328277561 is 165772823.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 210685225 + 117592336 = 14515^2 + 10844^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-328277561 is a prime.

It is a super-2 number, since 2×328277561² = 215532314112217442, which contains 22 as substring.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (328277567) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 164138780 + 164138781.

It is an arithmetic number, because the mean of its divisors is an integer number (164138781).

Almost surely, 2^328277561 is an apocalyptic number.

It is an amenable number.

328277561 is a deficient number, since it is larger than the sum of its proper divisors (1).

328277561 is an equidigital number, since it uses as much as digits as its factorization.

328277561 is an evil number, because the sum of its binary digits is even.

The product of its digits is 141120, while the sum is 41.

The square root of 328277561 is about 18118.4315270390. The cubic root of 328277561 is about 689.8379238452.

The spelling of 328277561 in words is "three hundred twenty-eight million, two hundred seventy-seven thousand, five hundred sixty-one".