408913121 has 4 divisors (see below), whose sum is σ = 432966852. Its totient is φ = 384859392.

The previous prime is 408913091. The next prime is 408913123. The reversal of 408913121 is 121319804.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 147282496 + 261630625 = 12136^2 + 16175^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-408913121 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (408913123) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 12026840 + ... + 12026873.

It is an arithmetic number, because the mean of its divisors is an integer number (108241713).

Almost surely, 2^408913121 is an apocalyptic number.

It is an amenable number.

408913121 is a deficient number, since it is larger than the sum of its proper divisors (24053731).

408913121 is a wasteful number, since it uses less digits than its factorization.

408913121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 24053730.

The product of its (nonzero) digits is 1728, while the sum is 29.

The square root of 408913121 is about 20221.6003570439. The cubic root of 408913121 is about 742.2388496130.

The spelling of 408913121 in words is "four hundred eight million, nine hundred thirteen thousand, one hundred twenty-one".