402117281 has 2 divisors, whose sum is σ = 402117282. Its totient is φ = 402117280.

The previous prime is 402117263. The next prime is 402117293. The reversal of 402117281 is 182711204.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 201640000 + 200477281 = 14200^2 + 14159^2 .

It is a cyclic number.

It is not a de Polignac number, because 402117281 - 2¹⁰ = 402116257 is a prime.

It is a super-2 number, since 2×402117281² = 323396615357665922, which contains 22 as substring.

It is a Chen prime.

It is a self number, because there is not a number n which added to its sum of digits gives 402117281.

It is not a weakly prime, because it can be changed into another prime (402117481) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 201058640 + 201058641.

It is an arithmetic number, because the mean of its divisors is an integer number (201058641).

Almost surely, 2^402117281 is an apocalyptic number.

It is an amenable number.

402117281 is a deficient number, since it is larger than the sum of its proper divisors (1).

402117281 is an equidigital number, since it uses as much as digits as its factorization.

402117281 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 896, while the sum is 26.

The square root of 402117281 is about 20052.8621647883. The cubic root of 402117281 is about 738.1040343395.

Adding to 402117281 its reverse (182711204), we get a palindrome (584828485).

The spelling of 402117281 in words is "four hundred two million, one hundred seventeen thousand, two hundred eighty-one".