1155144401 has 4 divisors (see below), whose sum is σ = 1155219252. Its totient is φ = 1155069552.

The previous prime is 1155144391. The next prime is 1155144409. The reversal of 1155144401 is 1044415511.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It can be written as a sum of positive squares in 2 ways, for example, as 982195600 + 172948801 = 31340^2 + 13151^2 .

It is a cyclic number.

It is not a de Polignac number, because 1155144401 - 2⁶ = 1155144337 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (1155144409) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 4790 + ... + 48303.

It is an arithmetic number, because the mean of its divisors is an integer number (288804813).

Almost surely, 2^1155144401 is an apocalyptic number.

It is an amenable number.

1155144401 is a deficient number, since it is larger than the sum of its proper divisors (74851).

1155144401 is an equidigital number, since it uses as much as digits as its factorization.

1155144401 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 74850.

The product of its (nonzero) digits is 1600, while the sum is 26.

The square root of 1155144401 is about 33987.4153327375. The cubic root of 1155144401 is about 1049.2494715192.

Adding to 1155144401 its reverse (1044415511), we get a palindrome (2199559912).

The spelling of 1155144401 in words is "one billion, one hundred fifty-five million, one hundred forty-four thousand, four hundred one".