3331561 has 2 divisors, whose sum is σ = 3331562. Its totient is φ = 3331560.

The previous prime is 3331519. The next prime is 3331577. The reversal of 3331561 is 1651333.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1806336 + 1525225 = 1344^2 + 1235^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-3331561 is a prime.

It is a super-2 number, since 2×3331561² = 22198597393442, which contains 22 as substring.

It is a Chen prime.

It is equal to p₂₃₉₀₀₈ and since 3331561 and 239008 have the same sum of digits, it is a Honaker prime.

It is not a weakly prime, because it can be changed into another prime (3331661) by changing a digit.

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 as a sum of consecutive naturals, namely, 1665780 + 1665781.

It is an arithmetic number, because the mean of its divisors is an integer number (1665781).

Almost surely, 2^3331561 is an apocalyptic number.

It is an amenable number.

3331561 is a deficient number, since it is larger than the sum of its proper divisors (1).

3331561 is an equidigital number, since it uses as much as digits as its factorization.

3331561 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 810, while the sum is 22.

The square root of 3331561 is about 1825.2564203421. The cubic root of 3331561 is about 149.3536783815.

Adding to 3331561 its reverse (1651333), we get a palindrome (4982894).

The spelling of 3331561 in words is "three million, three hundred thirty-one thousand, five hundred sixty-one".