1215168011 has 4 divisors (see below), whose sum is σ = 1217491992. Its totient is φ = 1212844032.

The previous prime is 1215167981. The next prime is 1215168037. The reversal of 1215168011 is 1108615121.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 1108615121 = 43 ⋅25781747.

It is a cyclic number.

It is not a de Polignac number, because 1215168011 - 2²² = 1210973707 is a prime.

It is a super-2 number, since 2×1215168011² = 2953266589915392242, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1215168611) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1161206 + ... + 1162251.

It is an arithmetic number, because the mean of its divisors is an integer number (304372998).

Almost surely, 2^1215168011 is an apocalyptic number.

1215168011 is a deficient number, since it is larger than the sum of its proper divisors (2323981).

1215168011 is an equidigital number, since it uses as much as digits as its factorization.

1215168011 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2323980.

The product of its (nonzero) digits is 480, while the sum is 26.

The square root of 1215168011 is about 34859.2600466504. The cubic root of 1215168011 is about 1067.1171740349.

The spelling of 1215168011 in words is "one billion, two hundred fifteen million, one hundred sixty-eight thousand, eleven".