5631216361 has 2 divisors, whose sum is σ = 5631216362. Its totient is φ = 5631216360.

The previous prime is 5631216359. The next prime is 5631216379. The reversal of 5631216361 is 1636121365.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 5392699225 + 238517136 = 73435^2 + 15444^2 .

It is a cyclic number.

It is not a de Polignac number, because 5631216361 - 2¹ = 5631216359 is a prime.

Together with 5631216359, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (5631216341) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 2815608180 + 2815608181.

It is an arithmetic number, because the mean of its divisors is an integer number (2815608181).

Almost surely, 2^5631216361 is an apocalyptic number.

It is an amenable number.

5631216361 is a deficient number, since it is larger than the sum of its proper divisors (1).

5631216361 is an equidigital number, since it uses as much as digits as its factorization.

5631216361 is an evil number, because the sum of its binary digits is even.

The product of its digits is 19440, while the sum is 34.

The square root of 5631216361 is about 75041.4309631686. The cubic root of 5631216361 is about 1779.1015498053.

The spelling of 5631216361 in words is "five billion, six hundred thirty-one million, two hundred sixteen thousand, three hundred sixty-one".