1321079143 has 4 divisors (see below), whose sum is σ = 1321229800. Its totient is φ = 1320928488.

The previous prime is 1321079141. The next prime is 1321079161. The reversal of 1321079143 is 3419701231.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 3419701231 = 2713 ⋅1260487.

It is a cyclic number.

It is not a de Polignac number, because 1321079143 - 2¹ = 1321079141 is a prime.

It is a super-2 number, since 2×1321079143² = 3490500204139228898, 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 (1321079141) 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 3 ways as a sum of consecutive naturals, for example, 61305 + ... + 80002.

It is an arithmetic number, because the mean of its divisors is an integer number (330307450).

Almost surely, 2^1321079143 is an apocalyptic number.

1321079143 is a deficient number, since it is larger than the sum of its proper divisors (150657).

1321079143 is an equidigital number, since it uses as much as digits as its factorization.

1321079143 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 150656.

The product of its (nonzero) digits is 4536, while the sum is 31.

The square root of 1321079143 is about 36346.6524318265. The cubic root of 1321079143 is about 1097.2601629293.

The spelling of 1321079143 in words is "one billion, three hundred twenty-one million, seventy-nine thousand, one hundred forty-three".