1215155 has 4 divisors (see below), whose sum is σ = 1458192. Its totient is φ = 972120.

The previous prime is 1215133. The next prime is 1215157. The reversal of 1215155 is 5515121.

It is a happy number.

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

It is not a de Polignac number, because 1215155 - 2¹⁰ = 1214131 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1215157) 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, 121511 + ... + 121520.

It is an arithmetic number, because the mean of its divisors is an integer number (364548).

2^1215155 is an apocalyptic number.

1215155 is a deficient number, since it is larger than the sum of its proper divisors (243037).

1215155 is an equidigital number, since it uses as much as digits as its factorization.

1215155 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 243036.

The product of its digits is 250, while the sum is 20.

The square root of 1215155 is about 1102.3406914380. The cubic root of 1215155 is about 106.7113365423.

The spelling of 1215155 in words is "one million, two hundred fifteen thousand, one hundred fifty-five".