402091 has 2 divisors, whose sum is σ = 402092. Its totient is φ = 402090.

The previous prime is 402089. The next prime is 402107. The reversal of 402091 is 190204.

It is an a-pointer prime, because the next prime (402107) can be obtained adding 402091 to its sum of digits (16).

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 402091 - 2¹ = 402089 is a prime.

Together with 402089, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (402071) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 201045 + 201046.

It is an arithmetic number, because the mean of its divisors is an integer number (201046).

2⁴⁰²⁰⁹¹ is an apocalyptic number.

402091 is a deficient number, since it is larger than the sum of its proper divisors (1).

402091 is an equidigital number, since it uses as much as digits as its factorization.

402091 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 72, while the sum is 16.

The square root of 402091 is about 634.1064579390. The cubic root of 402091 is about 73.8087954010.

Adding to 402091 its reverse (190204), we get a palindrome (592295).

The spelling of 402091 in words is "four hundred two thousand, ninety-one".