1211117628 has 48 divisors (see below), whose sum is σ = 3290595840. Its totient is φ = 339503424.

The previous prime is 1211117617. The next prime is 1211117629. The reversal of 1211117628 is 8267111121.

It is a junction number, because it is equal to n+sod(n) for n = 1211117595 and 1211117604.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1211117629) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 131568 + ... + 140471.

It is an arithmetic number, because the mean of its divisors is an integer number (68554080).

Almost surely, 2^1211117628 is an apocalyptic number.

It is an amenable number.

1211117628 is an abundant number, since it is smaller than the sum of its proper divisors (2079478212).

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

1211117628 is a wasteful number, since it uses less digits than its factorization.

1211117628 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 272106 (or 272104 counting only the distinct ones).

The product of its digits is 1344, while the sum is 30.

The square root of 1211117628 is about 34801.1153269547. The cubic root of 1211117628 is about 1065.9302203501.

Adding to 1211117628 its reverse (8267111121), we get a palindrome (9478228749).

The spelling of 1211117628 in words is "one billion, two hundred eleven million, one hundred seventeen thousand, six hundred twenty-eight".