1671631249 has 2 divisors, whose sum is σ = 1671631250. Its totient is φ = 1671631248.

The previous prime is 1671631219. The next prime is 1671631387. The reversal of 1671631249 is 9421361761.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1627315600 + 44315649 = 40340^2 + 6657^2 .

It is a cyclic number.

It is not a de Polignac number, because 1671631249 - 2⁵ = 1671631217 is a prime.

It is not a weakly prime, because it can be changed into another prime (1671631219) 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, 835815624 + 835815625.

It is an arithmetic number, because the mean of its divisors is an integer number (835815625).

Almost surely, 2^1671631249 is an apocalyptic number.

It is an amenable number.

1671631249 is a deficient number, since it is larger than the sum of its proper divisors (1).

1671631249 is an equidigital number, since it uses as much as digits as its factorization.

1671631249 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 54432, while the sum is 40.

The square root of 1671631249 is about 40885.5873016397. The cubic root of 1671631249 is about 1186.8071671776.

The spelling of 1671631249 in words is "one billion, six hundred seventy-one million, six hundred thirty-one thousand, two hundred forty-nine".