1564961243 has 2 divisors, whose sum is σ = 1564961244. Its totient is φ = 1564961242.

The previous prime is 1564961227. The next prime is 1564961257. The reversal of 1564961243 is 3421694651.

It is a strong prime.

It is an emirp because it is prime and its reverse (3421694651) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 1564961243 - 2⁴ = 1564961227 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 1564961243.

It is not a weakly prime, because it can be changed into another prime (1564961443) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 782480621 + 782480622.

It is an arithmetic number, because the mean of its divisors is an integer number (782480622).

Almost surely, 2^1564961243 is an apocalyptic number.

1564961243 is a deficient number, since it is larger than the sum of its proper divisors (1).

1564961243 is an equidigital number, since it uses as much as digits as its factorization.

1564961243 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 155520, while the sum is 41.

The square root of 1564961243 is about 39559.5910368143. The cubic root of 1564961243 is about 1161.0061729303.

The spelling of 1564961243 in words is "one billion, five hundred sixty-four million, nine hundred sixty-one thousand, two hundred forty-three".