1144215555 has 16 divisors (see below), whose sum is σ = 2092280064. Its totient is φ = 523069920.

The previous prime is 1144215547. The next prime is 1144215559. The reversal of 1144215555 is 5555124411.

It is a happy number.

It is not a de Polignac number, because 1144215555 - 2³ = 1144215547 is a prime.

It is not an unprimeable number, because it can be changed into a prime (1144215559) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 5448541 + ... + 5448750.

It is an arithmetic number, because the mean of its divisors is an integer number (130767504).

Almost surely, 2^1144215555 is an apocalyptic number.

1144215555 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

1144215555 is a deficient number, since it is larger than the sum of its proper divisors (948064509).

1144215555 is a wasteful number, since it uses less digits than its factorization.

1144215555 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10897306.

The product of its digits is 20000, while the sum is 33.

The square root of 1144215555 is about 33826.2554090754. The cubic root of 1144215555 is about 1045.9299902447.

Adding to 1144215555 its reverse (5555124411), we get a palindrome (6699339966).

The spelling of 1144215555 in words is "one billion, one hundred forty-four million, two hundred fifteen thousand, five hundred fifty-five".