3621181 has 2 divisors, whose sum is σ = 3621182. Its totient is φ = 3621180.

The previous prime is 3621157. The next prime is 3621199. The reversal of 3621181 is 1811263.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 3404025 + 217156 = 1845^2 + 466^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-3621181 is a prime.

It is a super-2 number, since 2×3621181² = 26225903669522, which contains 22 as substring.

It is an Ulam number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (3621481) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1810590 + 1810591.

It is an arithmetic number, because the mean of its divisors is an integer number (1810591).

Almost surely, 2^3621181 is an apocalyptic number.

It is an amenable number.

3621181 is a deficient number, since it is larger than the sum of its proper divisors (1).

3621181 is an equidigital number, since it uses as much as digits as its factorization.

3621181 is an evil number, because the sum of its binary digits is even.

The product of its digits is 288, while the sum is 22.

The square root of 3621181 is about 1902.9400936446. The cubic root of 3621181 is about 153.5618766832.

The spelling of 3621181 in words is "three million, six hundred twenty-one thousand, one hundred eighty-one".