1243143491 has 8 divisors (see below), whose sum is σ = 1304964864. Its totient is φ = 1181969800.

The previous prime is 1243143463. The next prime is 1243143497. The reversal of 1243143491 is 1943413421.

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 1243143491 - 2¹⁸ = 1242881347 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1243143497) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 157985 + ... + 165666.

It is an arithmetic number, because the mean of its divisors is an integer number (163120608).

Almost surely, 2^1243143491 is an apocalyptic number.

1243143491 is a deficient number, since it is larger than the sum of its proper divisors (61821373).

1243143491 is a wasteful number, since it uses less digits than its factorization.

1243143491 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 323841.

The product of its digits is 10368, while the sum is 32.

The square root of 1243143491 is about 35258.2400439954. The cubic root of 1243143491 is about 1075.2441460254.

The spelling of 1243143491 in words is "one billion, two hundred forty-three million, one hundred forty-three thousand, four hundred ninety-one".