405201091 has 2 divisors, whose sum is σ = 405201092. Its totient is φ = 405201090.

The previous prime is 405201089. The next prime is 405201109. The reversal of 405201091 is 190102504.

Together with next prime (405201109) it forms an Ormiston pair, because they use the same digits, order apart.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 405201091 - 2¹ = 405201089 is a prime.

Together with 405201089, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (405201491) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 202600545 + 202600546.

It is an arithmetic number, because the mean of its divisors is an integer number (202600546).

Almost surely, 2^405201091 is an apocalyptic number.

405201091 is a deficient number, since it is larger than the sum of its proper divisors (1).

405201091 is an equidigital number, since it uses as much as digits as its factorization.

405201091 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 360, while the sum is 22.

The square root of 405201091 is about 20129.6073235421. The cubic root of 405201091 is about 739.9860546435.

Adding to 405201091 its reverse (190102504), we get a palindrome (595303595).

The spelling of 405201091 in words is "four hundred five million, two hundred one thousand, ninety-one".