409598991 has 16 divisors (see below), whose sum is σ = 623215200. Its totient is φ = 265685184.

The previous prime is 409598989. The next prime is 409598993. The reversal of 409598991 is 199895904.

409598991 is a `hidden beast` number, since 40 + 9 + 598 + 9 + 9 + 1 = 666.

It is an interprime number because it is at equal distance from previous prime (409598989) and next prime (409598993).

It is not a de Polignac number, because 409598991 - 2¹ = 409598989 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (409598993) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 204006 + ... + 206003.

It is an arithmetic number, because the mean of its divisors is an integer number (38950950).

Almost surely, 2^409598991 is an apocalyptic number.

409598991 is a deficient number, since it is larger than the sum of its proper divisors (213616209).

409598991 is a wasteful number, since it uses less digits than its factorization.

409598991 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 410055 (or 410049 counting only the distinct ones).

The product of its (nonzero) digits is 1049760, while the sum is 54.

The square root of 409598991 is about 20238.5520974204. The cubic root of 409598991 is about 742.6536035646.

The spelling of 409598991 in words is "four hundred nine million, five hundred ninety-eight thousand, nine hundred ninety-one".