1243441155 has 64 divisors (see below), whose sum is σ = 2250915840. Its totient is φ = 580694400.

The previous prime is 1243441123. The next prime is 1243441159. The reversal of 1243441155 is 5511443421.

It is not a de Polignac number, because 1243441155 - 2⁵ = 1243441123 is a prime.

It is a super-2 number, since 2×1243441155² = 3092291811895468050, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (1243441159) by changing a digit.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 1447116 + ... + 1447974.

It is an arithmetic number, because the mean of its divisors is an integer number (35170560).

Almost surely, 2^1243441155 is an apocalyptic number.

1243441155 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

1243441155 is a deficient number, since it is larger than the sum of its proper divisors (1007474685).

1243441155 is a wasteful number, since it uses less digits than its factorization.

1243441155 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1192.

The product of its digits is 9600, while the sum is 30.

The square root of 1243441155 is about 35262.4609889894. The cubic root of 1243441155 is about 1075.3299596459.

Adding to 1243441155 its reverse (5511443421), we get a palindrome (6754884576).

The spelling of 1243441155 in words is "one billion, two hundred forty-three million, four hundred forty-one thousand, one hundred fifty-five".