1213611155 has 8 divisors (see below), whose sum is σ = 1457709792. Its totient is φ = 969971328.

The previous prime is 1213611131. The next prime is 1213611163. The reversal of 1213611155 is 5511163121.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 1213611155 - 2¹⁰ = 1213610131 is a prime.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 108854 + ... + 119483.

It is an arithmetic number, because the mean of its divisors is an integer number (182213724).

Almost surely, 2^1213611155 is an apocalyptic number.

1213611155 is a deficient number, since it is larger than the sum of its proper divisors (244098637).

1213611155 is a wasteful number, since it uses less digits than its factorization.

1213611155 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 229405.

The product of its digits is 900, while the sum is 26.

The square root of 1213611155 is about 34836.9222951741. The cubic root of 1213611155 is about 1066.6612541501.

Adding to 1213611155 its reverse (5511163121), we get a palindrome (6724774276).

The spelling of 1213611155 in words is "one billion, two hundred thirteen million, six hundred eleven thousand, one hundred fifty-five".