1215513667 has 4 divisors (see below), whose sum is σ = 1215718056. Its totient is φ = 1215309280.

The previous prime is 1215513661. The next prime is 1215513737. The reversal of 1215513667 is 7663155121.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 7663155121 = 191 ⋅40121231.

It is a cyclic number.

It is not a de Polignac number, because 1215513667 - 2³ = 1215513659 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1215513661) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 92998 + ... + 105259.

It is an arithmetic number, because the mean of its divisors is an integer number (303929514).

Almost surely, 2^1215513667 is an apocalyptic number.

1215513667 is a deficient number, since it is larger than the sum of its proper divisors (204389).

1215513667 is an equidigital number, since it uses as much as digits as its factorization.

1215513667 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 204388.

The product of its digits is 37800, while the sum is 37.

The square root of 1215513667 is about 34864.2175733229. The cubic root of 1215513667 is about 1067.2183453633.

Adding to 1215513667 its reverse (7663155121), we get a palindrome (8878668788).

The spelling of 1215513667 in words is "one billion, two hundred fifteen million, five hundred thirteen thousand, six hundred sixty-seven".