1671551549 has 2 divisors, whose sum is σ = 1671551550. Its totient is φ = 1671551548.

The previous prime is 1671551491. The next prime is 1671551573. The reversal of 1671551549 is 9451551761.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1670356900 + 1194649 = 40870^2 + 1093^2 .

It is a cyclic number.

It is not a de Polignac number, because 1671551549 - 2¹² = 1671547453 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1671551449) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 835775774 + 835775775.

It is an arithmetic number, because the mean of its divisors is an integer number (835775775).

Almost surely, 2^1671551549 is an apocalyptic number.

It is an amenable number.

1671551549 is a deficient number, since it is larger than the sum of its proper divisors (1).

1671551549 is an equidigital number, since it uses as much as digits as its factorization.

1671551549 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 189000, while the sum is 44.

The square root of 1671551549 is about 40884.6126189304. The cubic root of 1671551549 is about 1186.7883053553.

The spelling of 1671551549 in words is "one billion, six hundred seventy-one million, five hundred fifty-one thousand, five hundred forty-nine".