1645222547 has 2 divisors, whose sum is σ = 1645222548. Its totient is φ = 1645222546.

The previous prime is 1645222531. The next prime is 1645222567. The reversal of 1645222547 is 7452225461.

It is a weak prime.

It is an emirp because it is prime and its reverse (7452225461) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 1645222547 - 2⁴ = 1645222531 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 1645222547.

It is not a weakly prime, because it can be changed into another prime (1645222507) 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, 822611273 + 822611274.

It is an arithmetic number, because the mean of its divisors is an integer number (822611274).

Almost surely, 2^1645222547 is an apocalyptic number.

1645222547 is a deficient number, since it is larger than the sum of its proper divisors (1).

1645222547 is an equidigital number, since it uses as much as digits as its factorization.

1645222547 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 134400, while the sum is 38.

The square root of 1645222547 is about 40561.3430127751. The cubic root of 1645222547 is about 1180.5241727033.

The spelling of 1645222547 in words is "one billion, six hundred forty-five million, two hundred twenty-two thousand, five hundred forty-seven".