409742191 has 2 divisors, whose sum is σ = 409742192. Its totient is φ = 409742190.

The previous prime is 409742183. The next prime is 409742213. The reversal of 409742191 is 191247904.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 409742191 - 2³ = 409742183 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 409742191.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (409742101) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 204871095 + 204871096.

It is an arithmetic number, because the mean of its divisors is an integer number (204871096).

Almost surely, 2^409742191 is an apocalyptic number.

409742191 is a deficient number, since it is larger than the sum of its proper divisors (1).

409742191 is an equidigital number, since it uses as much as digits as its factorization.

409742191 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 18144, while the sum is 37.

The square root of 409742191 is about 20242.0895907512. The cubic root of 409742191 is about 742.7401399147.

The spelling of 409742191 in words is "four hundred nine million, seven hundred forty-two thousand, one hundred ninety-one".