1211235255 has 32 divisors (see below), whose sum is σ = 2222776320. Its totient is φ = 625151520.

The previous prime is 1211235253. The next prime is 1211235271. The reversal of 1211235255 is 5525321121.

1211235255 is a `hidden beast` number, since 12 + 1 + 123 + 525 + 5 = 666.

It is not a de Polignac number, because 1211235255 - 2¹ = 1211235253 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1211235253) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 140527 + ... + 148896.

It is an arithmetic number, because the mean of its divisors is an integer number (69461760).

Almost surely, 2^1211235255 is an apocalyptic number.

1211235255 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

1211235255 is a deficient number, since it is larger than the sum of its proper divisors (1011541065).

1211235255 is a wasteful number, since it uses less digits than its factorization.

1211235255 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 289468 (or 289462 counting only the distinct ones).

The product of its digits is 3000, while the sum is 27.

The square root of 1211235255 is about 34802.8052748625. The cubic root of 1211235255 is about 1065.9647279026.

Adding to 1211235255 its reverse (5525321121), we get a palindrome (6736556376).

The spelling of 1211235255 in words is "one billion, two hundred eleven million, two hundred thirty-five thousand, two hundred fifty-five".