1011222555 has 24 divisors (see below), whose sum is σ = 1882113552. Its totient is φ = 462272832.

The previous prime is 1011222523. The next prime is 1011222557. The reversal of 1011222555 is 5552221101.

It is not a de Polignac number, because 1011222555 - 2⁵ = 1011222523 is a prime.

It is not an unprimeable number, because it can be changed into a prime (1011222557) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 687172 + ... + 688641.

It is an arithmetic number, because the mean of its divisors is an integer number (78421398).

Almost surely, 2^1011222555 is an apocalyptic number.

1011222555 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

1011222555 is a deficient number, since it is larger than the sum of its proper divisors (870890997).

1011222555 is a wasteful number, since it uses less digits than its factorization.

1011222555 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1375835 (or 1375828 counting only the distinct ones).

The product of its (nonzero) digits is 1000, while the sum is 24.

The square root of 1011222555 is about 31799.7257063642. The cubic root of 1011222555 is about 1003.7269442970.

Adding to 1011222555 its reverse (5552221101), we get a palindrome (6563443656).

The spelling of 1011222555 in words is "one billion, eleven million, two hundred twenty-two thousand, five hundred fifty-five".