1222978543 has 2 divisors, whose sum is σ = 1222978544. Its totient is φ = 1222978542.

The previous prime is 1222978531. The next prime is 1222978553. The reversal of 1222978543 is 3458792221.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 1222978543 - 2⁵ = 1222978511 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 1222978543.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1222978553) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 611489271 + 611489272.

It is an arithmetic number, because the mean of its divisors is an integer number (611489272).

Almost surely, 2^1222978543 is an apocalyptic number.

1222978543 is a deficient number, since it is larger than the sum of its proper divisors (1).

1222978543 is an equidigital number, since it uses as much as digits as its factorization.

1222978543 is an evil number, because the sum of its binary digits is even.

The product of its digits is 241920, while the sum is 43.

The square root of 1222978543 is about 34971.1101196402. The cubic root of 1222978543 is about 1069.3986031475.

The spelling of 1222978543 in words is "one billion, two hundred twenty-two million, nine hundred seventy-eight thousand, five hundred forty-three".