1215105011 has 4 divisors (see below), whose sum is σ = 1219622400. Its totient is φ = 1210587624.

The previous prime is 1215105007. The next prime is 1215105013. The reversal of 1215105011 is 1105015121.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 1215105011 - 2² = 1215105007 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1215105013) 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, 2258291 + ... + 2258828.

It is an arithmetic number, because the mean of its divisors is an integer number (304905600).

Almost surely, 2^1215105011 is an apocalyptic number.

1215105011 is a deficient number, since it is larger than the sum of its proper divisors (4517389).

1215105011 is an equidigital number, since it uses as much as digits as its factorization.

1215105011 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4517388.

The product of its (nonzero) digits is 50, while the sum is 17.

The square root of 1215105011 is about 34858.3564012992. The cubic root of 1215105011 is about 1067.0987322657.

The spelling of 1215105011 in words is "one billion, two hundred fifteen million, one hundred five thousand, eleven".