1281321232 has 10 divisors (see below), whose sum is σ = 2482559918. Its totient is φ = 640660608.

The previous prime is 1281321227. The next prime is 1281321277. The reversal of 1281321232 is 2321231821.

It can be written as a sum of positive squares in only one way, i.e., 653518096 + 627803136 = 25564^2 + 25056^2 .

It is a junction number, because it is equal to n+sod(n) for n = 1281321197 and 1281321206.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 40041273 + ... + 40041304.

Almost surely, 2^1281321232 is an apocalyptic number.

It is an amenable number.

1281321232 is a deficient number, since it is larger than the sum of its proper divisors (1201238686).

1281321232 is an equidigital number, since it uses as much as digits as its factorization.

1281321232 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 80082585 (or 80082579 counting only the distinct ones).

The product of its digits is 1152, while the sum is 25.

The square root of 1281321232 is about 35795.5476560982. The cubic root of 1281321232 is about 1086.1404989459.

The spelling of 1281321232 in words is "one billion, two hundred eighty-one million, three hundred twenty-one thousand, two hundred thirty-two".