1220541155 has 4 divisors (see below), whose sum is σ = 1464649392. Its totient is φ = 976432920.

The previous prime is 1220541143. The next prime is 1220541169. The reversal of 1220541155 is 5511450221.

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

It is not a de Polignac number, because 1220541155 - 2²⁰ = 1219492579 is a prime.

It is a super-2 number, since 2×1220541155² = 2979441422097468050, which contains 22 as substring.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 122054111 + ... + 122054120.

It is an arithmetic number, because the mean of its divisors is an integer number (366162348).

Almost surely, 2^1220541155 is an apocalyptic number.

1220541155 is a deficient number, since it is larger than the sum of its proper divisors (244108237).

1220541155 is an equidigital number, since it uses as much as digits as its factorization.

1220541155 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 244108236.

The product of its (nonzero) digits is 2000, while the sum is 26.

The square root of 1220541155 is about 34936.2441455861. The cubic root of 1220541155 is about 1068.6876959223.

Adding to 1220541155 its reverse (5511450221), we get a palindrome (6731991376).

The spelling of 1220541155 in words is "one billion, two hundred twenty million, five hundred forty-one thousand, one hundred fifty-five".