1215226879 has 2 divisors, whose sum is σ = 1215226880. Its totient is φ = 1215226878.

The previous prime is 1215226823. The next prime is 1215226889. The reversal of 1215226879 is 9786225121.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 1215226879 - 2¹⁵ = 1215194111 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1215226819) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 607613439 + 607613440.

It is an arithmetic number, because the mean of its divisors is an integer number (607613440).

Almost surely, 2^1215226879 is an apocalyptic number.

1215226879 is a deficient number, since it is larger than the sum of its proper divisors (1).

1215226879 is an equidigital number, since it uses as much as digits as its factorization.

1215226879 is an evil number, because the sum of its binary digits is even.

The product of its digits is 120960, while the sum is 43.

The square root of 1215226879 is about 34860.1044031713. The cubic root of 1215226879 is about 1067.1344056821.

The spelling of 1215226879 in words is "one billion, two hundred fifteen million, two hundred twenty-six thousand, eight hundred seventy-nine".