1281244631 has 8 divisors (see below), whose sum is σ = 1307736144. Its totient is φ = 1254839040.

The previous prime is 1281244619. The next prime is 1281244637. The reversal of 1281244631 is 1364421821.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1281244631 is a prime.

It is a super-2 number, since 2×1281244631² = 3283175608932652322, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1281244637) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 9095 + ... + 51431.

It is an arithmetic number, because the mean of its divisors is an integer number (163467018).

Almost surely, 2^1281244631 is an apocalyptic number.

1281244631 is a deficient number, since it is larger than the sum of its proper divisors (26491513).

1281244631 is an equidigital number, since it uses as much as digits as its factorization.

1281244631 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 42961.

The product of its digits is 9216, while the sum is 32.

The square root of 1281244631 is about 35794.4776606672. The cubic root of 1281244631 is about 1086.1188543330.

The spelling of 1281244631 in words is "one billion, two hundred eighty-one million, two hundred forty-four thousand, six hundred thirty-one".