5631273581 has 2 divisors, whose sum is σ = 5631273582. Its totient is φ = 5631273580.

The previous prime is 5631273569. The next prime is 5631273587. The reversal of 5631273581 is 1853721365.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 4239312100 + 1391961481 = 65110^2 + 37309^2 .

It is a cyclic number.

It is not a de Polignac number, because 5631273581 - 2¹⁴ = 5631257197 is a prime.

It is a super-2 number, since 2×5631273581² = 63422484288137127122, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (5631273587) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 2815636790 + 2815636791.

It is an arithmetic number, because the mean of its divisors is an integer number (2815636791).

Almost surely, 2^5631273581 is an apocalyptic number.

It is an amenable number.

5631273581 is a deficient number, since it is larger than the sum of its proper divisors (1).

5631273581 is an equidigital number, since it uses as much as digits as its factorization.

5631273581 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 151200, while the sum is 41.

The square root of 5631273581 is about 75041.8122182560. The cubic root of 5631273581 is about 1779.1075757293.

The spelling of 5631273581 in words is "five billion, six hundred thirty-one million, two hundred seventy-three thousand, five hundred eighty-one".