1281233457 has 20 divisors (see below), whose sum is σ = 2187362496. Its totient is φ = 732133080.

The previous prime is 1281233449. The next prime is 1281233467. The reversal of 1281233457 is 7543321821.

It is not a de Polignac number, because 1281233457 - 2³ = 1281233449 is a prime.

It is not an unprimeable number, because it can be changed into a prime (1281233467) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 19 ways as a sum of consecutive naturals, for example, 1129269 + ... + 1130402.

Almost surely, 2^1281233457 is an apocalyptic number.

It is an amenable number.

1281233457 is a deficient number, since it is larger than the sum of its proper divisors (906129039).

1281233457 is an equidigital number, since it uses as much as digits as its factorization.

1281233457 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2259690 (or 2259681 counting only the distinct ones).

The product of its digits is 40320, while the sum is 36.

The square root of 1281233457 is about 35794.3215747973. The cubic root of 1281233457 is about 1086.1156969012.

The spelling of 1281233457 in words is "one billion, two hundred eighty-one million, two hundred thirty-three thousand, four hundred fifty-seven".