406161491 has 2 divisors, whose sum is σ = 406161492. Its totient is φ = 406161490.

The previous prime is 406161403. The next prime is 406161517. The reversal of 406161491 is 194161604.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 406161491 - 2¹⁰ = 406160467 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (406161191) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 203080745 + 203080746.

It is an arithmetic number, because the mean of its divisors is an integer number (203080746).

Almost surely, 2^406161491 is an apocalyptic number.

406161491 is a deficient number, since it is larger than the sum of its proper divisors (1).

406161491 is an equidigital number, since it uses as much as digits as its factorization.

406161491 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 5184, while the sum is 32.

The square root of 406161491 is about 20153.4486130786. The cubic root of 406161491 is about 740.5702270282.

The spelling of 406161491 in words is "four hundred six million, one hundred sixty-one thousand, four hundred ninety-one".