1211571255 has 64 divisors (see below), whose sum is σ = 2030469120. Its totient is φ = 616512000.

The previous prime is 1211571239. The next prime is 1211571289. The reversal of 1211571255 is 5521751121.

It is not a de Polignac number, because 1211571255 - 2⁴ = 1211571239 is a prime.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 6343210 + ... + 6343400.

It is an arithmetic number, because the mean of its divisors is an integer number (31726080).

Almost surely, 2^1211571255 is an apocalyptic number.

1211571255 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

1211571255 is a deficient number, since it is larger than the sum of its proper divisors (818897865).

1211571255 is a wasteful number, since it uses less digits than its factorization.

1211571255 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 432.

The product of its digits is 3500, while the sum is 30.

The square root of 1211571255 is about 34807.6321372196. The cubic root of 1211571255 is about 1066.0632859748.

The spelling of 1211571255 in words is "one billion, two hundred eleven million, five hundred seventy-one thousand, two hundred fifty-five".