1133551220 has 12 divisors (see below), whose sum is σ = 2380457604. Its totient is φ = 453420480.

The previous prime is 1133551213. The next prime is 1133551249. The reversal of 1133551220 is 221553311.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 442176784 + 691374436 = 21028^2 + 26294^2 .

It is a congruent number.

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, 28338761 + ... + 28338800.

It is an arithmetic number, because the mean of its divisors is an integer number (198371467).

Almost surely, 2^1133551220 is an apocalyptic number.

1133551220 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1133551220 is an abundant number, since it is smaller than the sum of its proper divisors (1246906384).

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

1133551220 is a wasteful number, since it uses less digits than its factorization.

1133551220 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 56677570 (or 56677568 counting only the distinct ones).

The product of its (nonzero) digits is 900, while the sum is 23.

The square root of 1133551220 is about 33668.2524048992. The cubic root of 1133551220 is about 1042.6704117138.

The spelling of 1133551220 in words is "one billion, one hundred thirty-three million, five hundred fifty-one thousand, two hundred twenty".