1243315681 has 8 divisors (see below), whose sum is σ = 1259322624. Its totient is φ = 1227333360.

The previous prime is 1243315511. The next prime is 1243315687. The reversal of 1243315681 is 1865133421.

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

It is a cyclic number.

It is not a de Polignac number, because 1243315681 - 2⁹ = 1243315169 is a prime.

It is a super-2 number, since 2×1243315681² = 3091667765240987522, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1243315687) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 109200 + ... + 120046.

It is an arithmetic number, because the mean of its divisors is an integer number (157415328).

Almost surely, 2^1243315681 is an apocalyptic number.

It is an amenable number.

1243315681 is a deficient number, since it is larger than the sum of its proper divisors (16006943).

1243315681 is a wasteful number, since it uses less digits than its factorization.

1243315681 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12311.

The product of its digits is 17280, while the sum is 34.

The square root of 1243315681 is about 35260.6817999879. The cubic root of 1243315681 is about 1075.2937883886.

The spelling of 1243315681 in words is "one billion, two hundred forty-three million, three hundred fifteen thousand, six hundred eighty-one".