6731222161 has 8 divisors (see below), whose sum is σ = 6984006120. Its totient is φ = 6479816448.

The previous prime is 6731222153. The next prime is 6731222167. The reversal of 6731222161 is 1612221376.

It can be written as a sum of positive squares in 4 ways, for example, as 4225 + 6731217936 = 65^2 + 82044^2 .

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 6731222161 - 2³ = 6731222153 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (6731222167) 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, 334606 + ... + 354151.

It is an arithmetic number, because the mean of its divisors is an integer number (873000765).

Almost surely, 2^6731222161 is an apocalyptic number.

It is an amenable number.

6731222161 is a deficient number, since it is larger than the sum of its proper divisors (252783959).

6731222161 is a wasteful number, since it uses less digits than its factorization.

6731222161 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 689123.

The product of its digits is 6048, while the sum is 31.

The square root of 6731222161 is about 82044.0257483749. The cubic root of 6731222161 is about 1888.1274587513.

The spelling of 6731222161 in words is "six billion, seven hundred thirty-one million, two hundred twenty-two thousand, one hundred sixty-one".