6221642731 has 4 divisors (see below), whose sum is σ = 6221966272. Its totient is φ = 6221319192.

The previous prime is 6221642729. The next prime is 6221642753. The reversal of 6221642731 is 1372461226.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 1372461226 = 2 ⋅686230613.

It is a cyclic number.

It is not a de Polignac number, because 6221642731 - 2¹ = 6221642729 is a prime.

It is a super-2 number, since 2×6221642731² = 77417676544410276722, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (6221640731) 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, 130971 + ... + 172036.

It is an arithmetic number, because the mean of its divisors is an integer number (1555491568).

Almost surely, 2^6221642731 is an apocalyptic number.

6221642731 is a deficient number, since it is larger than the sum of its proper divisors (323541).

6221642731 is a wasteful number, since it uses less digits than its factorization.

6221642731 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 323540.

The product of its digits is 24192, while the sum is 34.

The square root of 6221642731 is about 78877.3904930938. The cubic root of 6221642731 is about 1839.2256834691.

The spelling of 6221642731 in words is "six billion, two hundred twenty-one million, six hundred forty-two thousand, seven hundred thirty-one".