5221172381 has 2 divisors, whose sum is σ = 5221172382. Its totient is φ = 5221172380.

The previous prime is 5221172261. The next prime is 5221172387. The reversal of 5221172381 is 1832711225.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 5170904281 + 50268100 = 71909^2 + 7090^2 .

It is a cyclic number.

It is not a de Polignac number, because 5221172381 - 2²² = 5216978077 is a prime.

It is a super-2 number, since 2×5221172381² = 54521282064234418322, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (5221172387) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 2610586190 + 2610586191.

It is an arithmetic number, because the mean of its divisors is an integer number (2610586191).

Almost surely, 2^5221172381 is an apocalyptic number.

It is an amenable number.

5221172381 is a deficient number, since it is larger than the sum of its proper divisors (1).

5221172381 is an equidigital number, since it uses as much as digits as its factorization.

5221172381 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 6720, while the sum is 32.

The square root of 5221172381 is about 72257.6804291419. The cubic root of 5221172381 is about 1734.8263528537.

The spelling of 5221172381 in words is "five billion, two hundred twenty-one million, one hundred seventy-two thousand, three hundred eighty-one".