1155421312 has 32 divisors (see below), whose sum is σ = 2422969200. Its totient is φ = 547303680.

The previous prime is 1155421273. The next prime is 1155421321. The reversal of 1155421312 is 2131245511.

It is a tau number, because it is divible by the number of its divisors (32).

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, 235114 + ... + 239977.

Almost surely, 2^1155421312 is an apocalyptic number.

It is an amenable number.

1155421312 is an abundant number, since it is smaller than the sum of its proper divisors (1267547888).

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

1155421312 is an equidigital number, since it uses as much as digits as its factorization.

1155421312 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 475124 (or 475112 counting only the distinct ones).

The product of its digits is 1200, while the sum is 25.

The square root of 1155421312 is about 33991.4888170554. The cubic root of 1155421312 is about 1049.3333067830. Note that the first 4 decimals are identical.

Adding to 1155421312 its reverse (2131245511), we get a palindrome (3286666823).

The spelling of 1155421312 in words is "one billion, one hundred fifty-five million, four hundred twenty-one thousand, three hundred twelve".