1211444145 has 12 divisors (see below), whose sum is σ = 2099836596. Its totient is φ = 646103520.

The previous prime is 1211444093. The next prime is 1211444153. The reversal of 1211444145 is 5414441121.

It is a happy number.

1211444145 is a `hidden beast` number, since 1 + 211 + 4 + 441 + 4 + 5 = 666.

It can be written as a sum of positive squares in 2 ways, for example, as 714332529 + 497111616 = 26727^2 + 22296^2 .

It is not a de Polignac number, because 1211444145 - 2⁸ = 1211443889 is a prime.

It is a super-3 number, since 3×1211444145³ (a number of 28 digits) contains 333 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 13460446 + ... + 13460535.

It is an arithmetic number, because the mean of its divisors is an integer number (174986383).

Almost surely, 2^1211444145 is an apocalyptic number.

1211444145 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

1211444145 is a deficient number, since it is larger than the sum of its proper divisors (888392451).

1211444145 is a wasteful number, since it uses less digits than its factorization.

1211444145 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 26920992 (or 26920989 counting only the distinct ones).

The product of its digits is 2560, while the sum is 27.

The square root of 1211444145 is about 34805.8061966678. The cubic root of 1211444145 is about 1066.0260032471.

Adding to 1211444145 its reverse (5414441121), we get a palindrome (6625885266).

The spelling of 1211444145 in words is "one billion, two hundred eleven million, four hundred forty-four thousand, one hundred forty-five".