5631163381 has 2 divisors, whose sum is σ = 5631163382. Its totient is φ = 5631163380.

The previous prime is 5631163319. The next prime is 5631163387. The reversal of 5631163381 is 1833611365.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 5233799025 + 397364356 = 72345^2 + 19934^2 .

It is a cyclic number.

It is not a de Polignac number, because 5631163381 - 2¹⁹ = 5630639093 is a prime.

It is a super-2 number, since 2×5631163381² = 63420002047030702322, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 5631163381.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (5631163387) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 2815581690 + 2815581691.

It is an arithmetic number, because the mean of its divisors is an integer number (2815581691).

Almost surely, 2^5631163381 is an apocalyptic number.

It is an amenable number.

5631163381 is a deficient number, since it is larger than the sum of its proper divisors (1).

5631163381 is an equidigital number, since it uses as much as digits as its factorization.

5631163381 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 38880, while the sum is 37.

The square root of 5631163381 is about 75041.0779573428. The cubic root of 5631163381 is about 1779.0959703656.

The spelling of 5631163381 in words is "five billion, six hundred thirty-one million, one hundred sixty-three thousand, three hundred eighty-one".