1211255650 has 96 divisors (see below), whose sum is σ = 2535194880. Its totient is φ = 426816000.

The previous prime is 1211255641. The next prime is 1211255651. The reversal of 1211255650 is 565521121.

It is not an unprimeable number, because it can be changed into a prime (1211255651) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 2650222 + ... + 2650678.

It is an arithmetic number, because the mean of its divisors is an integer number (26408280).

Almost surely, 2^1211255650 is an apocalyptic number.

1211255650 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

1211255650 is an abundant number, since it is smaller than the sum of its proper divisors (1323939230).

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

1211255650 is a wasteful number, since it uses less digits than its factorization.

1211255650 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 620 (or 615 counting only the distinct ones).

The product of its (nonzero) digits is 3000, while the sum is 28.

The square root of 1211255650 is about 34803.0982816185. The cubic root of 1211255650 is about 1065.9707108384.

Adding to 1211255650 its reverse (565521121), we get a palindrome (1776776771).

The spelling of 1211255650 in words is "one billion, two hundred eleven million, two hundred fifty-five thousand, six hundred fifty".