1215120667 has 2 divisors, whose sum is σ = 1215120668. Its totient is φ = 1215120666.

The previous prime is 1215120653. The next prime is 1215120691. The reversal of 1215120667 is 7660215121.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1215120667 is a prime.

It is not a weakly prime, because it can be changed into another prime (1215120637) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 607560333 + 607560334.

It is an arithmetic number, because the mean of its divisors is an integer number (607560334).

Almost surely, 2^1215120667 is an apocalyptic number.

1215120667 is a deficient number, since it is larger than the sum of its proper divisors (1).

1215120667 is an equidigital number, since it uses as much as digits as its factorization.

1215120667 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 5040, while the sum is 31.

The square root of 1215120667 is about 34858.5809665282. The cubic root of 1215120667 is about 1067.1033152513.

Adding to 1215120667 its reverse (7660215121), we get a palindrome (8875335788).

The spelling of 1215120667 in words is "one billion, two hundred fifteen million, one hundred twenty thousand, six hundred sixty-seven".