6403181 has 2 divisors, whose sum is σ = 6403182. Its totient is φ = 6403180.

The previous prime is 6403157. The next prime is 6403193. The reversal of 6403181 is 1813046.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 6375625 + 27556 = 2525^2 + 166^2 .

It is a cyclic number.

It is not a de Polignac number, because 6403181 - 2¹⁰ = 6402157 is a prime.

It is a super-2 number, since 2×6403181² = 82001453837522, which contains 22 as substring.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (6403141) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3201590 + 3201591.

It is an arithmetic number, because the mean of its divisors is an integer number (3201591).

Almost surely, 2^6403181 is an apocalyptic number.

It is an amenable number.

6403181 is a deficient number, since it is larger than the sum of its proper divisors (1).

6403181 is an equidigital number, since it uses as much as digits as its factorization.

6403181 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 576, while the sum is 23.

The square root of 6403181 is about 2530.4507503605. The cubic root of 6403181 is about 185.6943084457.

The spelling of 6403181 in words is "six million, four hundred three thousand, one hundred eighty-one".