402605171 has 2 divisors, whose sum is σ = 402605172. Its totient is φ = 402605170.

The previous prime is 402605131. The next prime is 402605183. The reversal of 402605171 is 171506204.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 402605171 - 2⁶ = 402605107 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 402605171.

It is not a weakly prime, because it can be changed into another prime (402605131) 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, 201302585 + 201302586.

It is an arithmetic number, because the mean of its divisors is an integer number (201302586).

Almost surely, 2^402605171 is an apocalyptic number.

402605171 is a deficient number, since it is larger than the sum of its proper divisors (1).

402605171 is an equidigital number, since it uses as much as digits as its factorization.

402605171 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1680, while the sum is 26.

The square root of 402605171 is about 20065.0235733726. The cubic root of 402605171 is about 738.4024282411.

The spelling of 402605171 in words is "four hundred two million, six hundred five thousand, one hundred seventy-one".