1281185132 has 12 divisors (see below), whose sum is σ = 2246758080. Its totient is φ = 639254256.

The previous prime is 1281185083. The next prime is 1281185137. The reversal of 1281185132 is 2315811821.

It is not an unprimeable number, because it can be changed into a prime (1281185137) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 332423 + ... + 336254.

It is an arithmetic number, because the mean of its divisors is an integer number (187229840).

Almost surely, 2^1281185132 is an apocalyptic number.

It is an amenable number.

1281185132 is a deficient number, since it is larger than the sum of its proper divisors (965572948).

1281185132 is a wasteful number, since it uses less digits than its factorization.

1281185132 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 669160 (or 669158 counting only the distinct ones).

The product of its digits is 3840, while the sum is 32.

The square root of 1281185132 is about 35793.6465311932. The cubic root of 1281185132 is about 1086.1020415182.

Adding to 1281185132 its reverse (2315811821), we get a palindrome (3596996953).

The spelling of 1281185132 in words is "one billion, two hundred eighty-one million, one hundred eighty-five thousand, one hundred thirty-two".