409543981 has 12 divisors (see below), whose sum is σ = 514469536. Its totient is φ = 319124520.

The previous prime is 409543963. The next prime is 409544011. The reversal of 409543981 is 189345904.

It is a happy number.

It is not a de Polignac number, because 409543981 - 2¹⁵ = 409511213 is a prime.

It is a super-2 number, since 2×409543981² = 335452544746656722, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (409543921) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 240915 + ... + 242608.

Almost surely, 2^409543981 is an apocalyptic number.

It is an amenable number.

409543981 is a deficient number, since it is larger than the sum of its proper divisors (104925555).

409543981 is a wasteful number, since it uses less digits than its factorization.

409543981 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 483552 (or 483541 counting only the distinct ones).

The product of its (nonzero) digits is 155520, while the sum is 43.

The square root of 409543981 is about 20237.1930118779. The cubic root of 409543981 is about 742.6203554328.

The spelling of 409543981 in words is "four hundred nine million, five hundred forty-three thousand, nine hundred eighty-one".