409407491 has 2 divisors, whose sum is σ = 409407492. Its totient is φ = 409407490.

The previous prime is 409407473. The next prime is 409407499. The reversal of 409407491 is 194704904.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-409407491 is a prime.

It is a super-2 number, since 2×409407491² = 335228987373830162, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (409407499) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 204703745 + 204703746.

It is an arithmetic number, because the mean of its divisors is an integer number (204703746).

Almost surely, 2^409407491 is an apocalyptic number.

409407491 is a deficient number, since it is larger than the sum of its proper divisors (1).

409407491 is an equidigital number, since it uses as much as digits as its factorization.

409407491 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 36288, while the sum is 38.

The square root of 409407491 is about 20233.8204746410. The cubic root of 409407491 is about 742.5378477988.

The spelling of 409407491 in words is "four hundred nine million, four hundred seven thousand, four hundred ninety-one".