1101311556 has 12 divisors (see below), whose sum is σ = 2569726992. Its totient is φ = 367103848.

The previous prime is 1101311513. The next prime is 1101311647. The reversal of 1101311556 is 6551131011.

It is a happy number.

It is a tau number, because it is divible by the number of its divisors (12).

It is a super-2 number, since 2×1101311556² = 2425774286758282272, which contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 45887970 + ... + 45887993.

It is an arithmetic number, because the mean of its divisors is an integer number (214143916).

Almost surely, 2^1101311556 is an apocalyptic number.

It is an amenable number.

1101311556 is an abundant number, since it is smaller than the sum of its proper divisors (1468415436).

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

1101311556 is a wasteful number, since it uses less digits than its factorization.

1101311556 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 91775970 (or 91775968 counting only the distinct ones).

The product of its (nonzero) digits is 450, while the sum is 24.

The square root of 1101311556 is about 33186.0144639274. The cubic root of 1101311556 is about 1032.6902231662.

Adding to 1101311556 its reverse (6551131011), we get a palindrome (7652442567).

The spelling of 1101311556 in words is "one billion, one hundred one million, three hundred eleven thousand, five hundred fifty-six".