1645132277 has 2 divisors, whose sum is σ = 1645132278. Its totient is φ = 1645132276.

The previous prime is 1645132253. The next prime is 1645132297. The reversal of 1645132277 is 7722315461.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1304582161 + 340550116 = 36119^2 + 18454^2 .

It is a cyclic number.

It is not a de Polignac number, because 1645132277 - 2¹⁸ = 1644870133 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 1645132277.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1645132207) 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, 822566138 + 822566139.

It is an arithmetic number, because the mean of its divisors is an integer number (822566139).

Almost surely, 2^1645132277 is an apocalyptic number.

It is an amenable number.

1645132277 is a deficient number, since it is larger than the sum of its proper divisors (1).

1645132277 is an equidigital number, since it uses as much as digits as its factorization.

1645132277 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 70560, while the sum is 38.

The square root of 1645132277 is about 40560.2302384984. The cubic root of 1645132277 is about 1180.5025813252.

The spelling of 1645132277 in words is "one billion, six hundred forty-five million, one hundred thirty-two thousand, two hundred seventy-seven".