1222774639 has 2 divisors, whose sum is σ = 1222774640. Its totient is φ = 1222774638.

The previous prime is 1222774627. The next prime is 1222774643. The reversal of 1222774639 is 9364772221.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 1222774639 - 2²¹ = 1220677487 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 1222774595 and 1222774604.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1222774699) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 611387319 + 611387320.

It is an arithmetic number, because the mean of its divisors is an integer number (611387320).

Almost surely, 2^1222774639 is an apocalyptic number.

1222774639 is a deficient number, since it is larger than the sum of its proper divisors (1).

1222774639 is an equidigital number, since it uses as much as digits as its factorization.

1222774639 is an evil number, because the sum of its binary digits is even.

The product of its digits is 254016, while the sum is 43.

The square root of 1222774639 is about 34968.1946774494. The cubic root of 1222774639 is about 1069.3391671708.

The spelling of 1222774639 in words is "one billion, two hundred twenty-two million, seven hundred seventy-four thousand, six hundred thirty-nine".