1645112149 has 2 divisors, whose sum is σ = 1645112150. Its totient is φ = 1645112148.

The previous prime is 1645112137. The next prime is 1645112173. The reversal of 1645112149 is 9412115461.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1590573924 + 54538225 = 39882^2 + 7385^2 .

It is a cyclic number.

It is not a de Polignac number, because 1645112149 - 2¹¹ = 1645110101 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1645112179) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 822556074 + 822556075.

It is an arithmetic number, because the mean of its divisors is an integer number (822556075).

Almost surely, 2^1645112149 is an apocalyptic number.

It is an amenable number.

1645112149 is a deficient number, since it is larger than the sum of its proper divisors (1).

1645112149 is an equidigital number, since it uses as much as digits as its factorization.

1645112149 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 8640, while the sum is 34.

The square root of 1645112149 is about 40559.9821129152. The cubic root of 1645112149 is about 1180.4977668688.

The spelling of 1645112149 in words is "one billion, six hundred forty-five million, one hundred twelve thousand, one hundred forty-nine".