1215451045111 has 4 divisors (see below), whose sum is σ = 1238384083752. Its totient is φ = 1192518006472.

The previous prime is 1215451045057. The next prime is 1215451045147. The reversal of 1215451045111 is 1115401545121.

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 1215451045111 - 2¹¹ = 1215451043063 is a prime.

It is a super-2 number, since 2×1215451045111² (a number of 25 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1215451045181) 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, 11466519241 + ... + 11466519346.

It is an arithmetic number, because the mean of its divisors is an integer number (309596020938).

Almost surely, 2^{1215451045111} is an apocalyptic number.

1215451045111 is a deficient number, since it is larger than the sum of its proper divisors (22933038641).

1215451045111 is an equidigital number, since it uses as much as digits as its factorization.

1215451045111 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 22933038640.

The product of its (nonzero) digits is 4000, while the sum is 31.

The spelling of 1215451045111 in words is "one trillion, two hundred fifteen billion, four hundred fifty-one million, forty-five thousand, one hundred eleven".