1155201812 has 6 divisors (see below), whose sum is σ = 2021603178. Its totient is φ = 577600904.

The previous prime is 1155201811. The next prime is 1155201857. The reversal of 1155201812 is 2181025511.

It can be written as a sum of positive squares in only one way, i.e., 764190736 + 391011076 = 27644^2 + 19774^2 .

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1155201811) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 144400223 + ... + 144400230.

It is an arithmetic number, because the mean of its divisors is an integer number (336933863).

Almost surely, 2^1155201812 is an apocalyptic number.

It is an amenable number.

1155201812 is a deficient number, since it is larger than the sum of its proper divisors (866401366).

1155201812 is a wasteful number, since it uses less digits than its factorization.

1155201812 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 288800457 (or 288800455 counting only the distinct ones).

The product of its (nonzero) digits is 800, while the sum is 26.

The square root of 1155201812 is about 33988.2599142704. The cubic root of 1155201812 is about 1049.2668538954.

The spelling of 1155201812 in words is "one billion, one hundred fifty-five million, two hundred one thousand, eight hundred twelve".