408572861 has 2 divisors, whose sum is σ = 408572862. Its totient is φ = 408572860.

The previous prime is 408572809. The next prime is 408572873. The reversal of 408572861 is 168275804.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 402764761 + 5808100 = 20069^2 + 2410^2 .

It is a cyclic number.

It is not a de Polignac number, because 408572861 - 2⁶ = 408572797 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (408572891) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 204286430 + 204286431.

It is an arithmetic number, because the mean of its divisors is an integer number (204286431).

Almost surely, 2^408572861 is an apocalyptic number.

It is an amenable number.

408572861 is a deficient number, since it is larger than the sum of its proper divisors (1).

408572861 is an equidigital number, since it uses as much as digits as its factorization.

408572861 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 107520, while the sum is 41.

The square root of 408572861 is about 20213.1853254256. The cubic root of 408572861 is about 742.0329181154.

The spelling of 408572861 in words is "four hundred eight million, five hundred seventy-two thousand, eight hundred sixty-one".