1245564043 has 2 divisors, whose sum is σ = 1245564044. Its totient is φ = 1245564042.

The previous prime is 1245563999. The next prime is 1245564059. The reversal of 1245564043 is 3404655421.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1245564043 is a prime.

It is not a weakly prime, because it can be changed into another prime (1245564443) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 622782021 + 622782022.

It is an arithmetic number, because the mean of its divisors is an integer number (622782022).

Almost surely, 2^1245564043 is an apocalyptic number.

1245564043 is a deficient number, since it is larger than the sum of its proper divisors (1).

1245564043 is an equidigital number, since it uses as much as digits as its factorization.

1245564043 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 57600, while the sum is 34.

The square root of 1245564043 is about 35292.5493978545. The cubic root of 1245564043 is about 1075.9415707298.

The spelling of 1245564043 in words is "one billion, two hundred forty-five million, five hundred sixty-four thousand, forty-three".