1211255808 has 352 divisors, whose sum is σ = 4024565760. Its totient is φ = 316293120.

The previous prime is 1211255807. The next prime is 1211255819. The reversal of 1211255808 is 8085521121.

It is not an unprimeable number, because it can be changed into a prime (1211255807) 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, 15332313 + ... + 15332391.

Almost surely, 2^1211255808 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 1211255808, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2012282880).

1211255808 is an abundant number, since it is smaller than the sum of its proper divisors (2813309952).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

1211255808 is a wasteful number, since it uses less digits than its factorization.

1211255808 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 163 (or 145 counting only the distinct ones).

The product of its (nonzero) digits is 6400, while the sum is 33.

The square root of 1211255808 is about 34803.1005515313. The cubic root of 1211255808 is about 1065.9707571880.

Adding to 1211255808 its reverse (8085521121), we get a palindrome (9296776929).

The spelling of 1211255808 in words is "one billion, two hundred eleven million, two hundred fifty-five thousand, eight hundred eight".