402042204181 has 2 divisors, whose sum is σ = 402042204182. Its totient is φ = 402042204180.

The previous prime is 402042204041. The next prime is 402042204217. The reversal of 402042204181 is 181402240204.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 279518403025 + 122523801156 = 528695^2 + 350034^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-402042204181 is a prime.

It is a super-2 number, since 2×402042204181² (a number of 24 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (402042204581) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 201021102090 + 201021102091.

It is an arithmetic number, because the mean of its divisors is an integer number (201021102091).

Almost surely, 2^402042204181 is an apocalyptic number.

It is an amenable number.

402042204181 is a deficient number, since it is larger than the sum of its proper divisors (1).

402042204181 is an equidigital number, since it uses as much as digits as its factorization.

402042204181 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 4096, while the sum is 28.

Adding to 402042204181 its reverse (181402240204), we get a palindrome (583444444385).

The spelling of 402042204181 in words is "four hundred two billion, forty-two million, two hundred four thousand, one hundred eighty-one".