549221381 has 2 divisors, whose sum is σ = 549221382. Its totient is φ = 549221380.

The previous prime is 549221297. The next prime is 549221399. The reversal of 549221381 is 183122945.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 532040356 + 17181025 = 23066^2 + 4145^2 .

It is a cyclic number.

It is not a de Polignac number, because 549221381 - 2¹⁸ = 548959237 is a prime.

It is a super-2 number, since 2×549221381² = 603288250695094322, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (549221681) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 274610690 + 274610691.

It is an arithmetic number, because the mean of its divisors is an integer number (274610691).

Almost surely, 2^549221381 is an apocalyptic number.

It is an amenable number.

549221381 is a deficient number, since it is larger than the sum of its proper divisors (1).

549221381 is an equidigital number, since it uses as much as digits as its factorization.

549221381 is an evil number, because the sum of its binary digits is even.

The product of its digits is 17280, while the sum is 35.

The square root of 549221381 is about 23435.4727069884. The cubic root of 549221381 is about 818.9344582475.

The spelling of 549221381 in words is "five hundred forty-nine million, two hundred twenty-one thousand, three hundred eighty-one".