1225655279 has 2 divisors, whose sum is σ = 1225655280. Its totient is φ = 1225655278.

The previous prime is 1225655267. The next prime is 1225655357. The reversal of 1225655279 is 9725565221.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 1225655279 - 2⁸ = 1225655023 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1225655779) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 612827639 + 612827640.

It is an arithmetic number, because the mean of its divisors is an integer number (612827640).

Almost surely, 2^1225655279 is an apocalyptic number.

1225655279 is a deficient number, since it is larger than the sum of its proper divisors (1).

1225655279 is an equidigital number, since it uses as much as digits as its factorization.

1225655279 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 378000, while the sum is 44.

The square root of 1225655279 is about 35009.3598770386. The cubic root of 1225655279 is about 1070.1782330399.

The spelling of 1225655279 in words is "one billion, two hundred twenty-five million, six hundred fifty-five thousand, two hundred seventy-nine".