401202181 has 2 divisors, whose sum is σ = 401202182. Its totient is φ = 401202180.

The previous prime is 401202161. The next prime is 401202203. The reversal of 401202181 is 181202104.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 254913156 + 146289025 = 15966^2 + 12095^2 .

It is a cyclic number.

It is not a de Polignac number, because 401202181 - 2⁵ = 401202149 is a prime.

It is a super-2 number, since 2×401202181² = 321926380078313522, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (401202101) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 200601090 + 200601091.

It is an arithmetic number, because the mean of its divisors is an integer number (200601091).

Almost surely, 2^401202181 is an apocalyptic number.

It is an amenable number.

401202181 is a deficient number, since it is larger than the sum of its proper divisors (1).

401202181 is an equidigital number, since it uses as much as digits as its factorization.

401202181 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 128, while the sum is 19.

The square root of 401202181 is about 20030.0319770089. The cubic root of 401202181 is about 737.5437069185.

Adding to 401202181 its reverse (181202104), we get a palindrome (582404285).

The spelling of 401202181 in words is "four hundred one million, two hundred two thousand, one hundred eighty-one".