402689171 has 2 divisors, whose sum is σ = 402689172. Its totient is φ = 402689170.

The previous prime is 402689123. The next prime is 402689179. The reversal of 402689171 is 171986204.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 402689171 - 2⁶ = 402689107 is a prime.

It is not a weakly prime, because it can be changed into another prime (402689179) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 201344585 + 201344586.

It is an arithmetic number, because the mean of its divisors is an integer number (201344586).

Almost surely, 2^402689171 is an apocalyptic number.

402689171 is a deficient number, since it is larger than the sum of its proper divisors (1).

402689171 is an equidigital number, since it uses as much as digits as its factorization.

402689171 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 24192, while the sum is 38.

The square root of 402689171 is about 20067.1166588526. The cubic root of 402689171 is about 738.4537783770.

The spelling of 402689171 in words is "four hundred two million, six hundred eighty-nine thousand, one hundred seventy-one".