3143685721 has 4 divisors (see below), whose sum is σ = 3429475344. Its totient is φ = 2857896100.

The previous prime is 3143685709. The next prime is 3143685733. The reversal of 3143685721 is 1275863413.

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 an interprime number because it is at equal distance from previous prime (3143685709) and next prime (3143685733).

It is a cyclic number.

It is not a de Polignac number, because 3143685721 - 2⁵ = 3143685689 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (3143685791) 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, 142894795 + ... + 142894816.

It is an arithmetic number, because the mean of its divisors is an integer number (857368836).

Almost surely, 2^3143685721 is an apocalyptic number.

It is an amenable number.

3143685721 is a deficient number, since it is larger than the sum of its proper divisors (285789623).

3143685721 is a wasteful number, since it uses less digits than its factorization.

3143685721 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 285789622.

The product of its digits is 120960, while the sum is 40.

The square root of 3143685721 is about 56068.5805152939. The cubic root of 3143685721 is about 1464.9170738975.

The spelling of 3143685721 in words is "three billion, one hundred forty-three million, six hundred eighty-five thousand, seven hundred twenty-one".