1243332681 has 4 divisors (see below), whose sum is σ = 1657776912. Its totient is φ = 828888452.

The previous prime is 1243332679. The next prime is 1243332691. The reversal of 1243332681 is 1862333421.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 1243332681 - 2¹ = 1243332679 is a prime.

It is a super-2 number, since 2×1243332681² = 3091752311285295522, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (1243332611) 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, 207222111 + ... + 207222116.

It is an arithmetic number, because the mean of its divisors is an integer number (414444228).

Almost surely, 2^1243332681 is an apocalyptic number.

It is an amenable number.

1243332681 is a deficient number, since it is larger than the sum of its proper divisors (414444231).

1243332681 is an equidigital number, since it uses as much as digits as its factorization.

1243332681 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 414444230.

The product of its digits is 20736, while the sum is 33.

The square root of 1243332681 is about 35260.9228608668. The cubic root of 1243332681 is about 1075.2986892386.

The spelling of 1243332681 in words is "one billion, two hundred forty-three million, three hundred thirty-two thousand, six hundred eighty-one".