1219155 has 32 divisors (see below), whose sum is σ = 2363904. Its totient is φ = 523776.

The previous prime is 1219147. The next prime is 1219177. The reversal of 1219155 is 5519121.

It is not a de Polignac number, because 1219155 - 2³ = 1219147 is a prime.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 1444 + ... + 2126.

It is an arithmetic number, because the mean of its divisors is an integer number (73872).

2^1219155 is an apocalyptic number.

1219155 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

1219155 is a deficient number, since it is larger than the sum of its proper divisors (1144749).

1219155 is a wasteful number, since it uses less digits than its factorization.

1219155 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 715.

The product of its digits is 450, while the sum is 24.

The square root of 1219155 is about 1104.1535219343. The cubic root of 1219155 is about 106.8282977100.

It can be divided in two parts, 12191 and 55, that added together give a triangular number (12246 = T₁₅₆).

The spelling of 1219155 in words is "one million, two hundred nineteen thousand, one hundred fifty-five".