6181649 has 2 divisors, whose sum is σ = 6181650. Its totient is φ = 6181648.

The previous prime is 6181639. The next prime is 6181657. The reversal of 6181649 is 9461816.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 5313025 + 868624 = 2305^2 + 932^2 .

It is a cyclic number.

It is not a de Polignac number, because 6181649 - 2⁴ = 6181633 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (6181619) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3090824 + 3090825.

It is an arithmetic number, because the mean of its divisors is an integer number (3090825).

Almost surely, 2^6181649 is an apocalyptic number.

It is an amenable number.

6181649 is a deficient number, since it is larger than the sum of its proper divisors (1).

6181649 is an equidigital number, since it uses as much as digits as its factorization.

6181649 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 10368, while the sum is 35.

The square root of 6181649 is about 2486.2922193499. The cubic root of 6181649 is about 183.5276261594.

The spelling of 6181649 in words is "six million, one hundred eighty-one thousand, six hundred forty-nine".