409569381 has 12 divisors (see below), whose sum is σ = 637108108. Its totient is φ = 252042624.

The previous prime is 409569379. The next prime is 409569383. The reversal of 409569381 is 183965904.

It is a happy number.

409569381 is a `hidden beast` number, since 4 + 0 + 9 + 569 + 3 + 81 = 666.

It is an interprime number because it is at equal distance from previous prime (409569379) and next prime (409569383).

It can be written as a sum of positive squares in 2 ways, for example, as 107122500 + 302446881 = 10350^2 + 17391^2 .

It is not a de Polignac number, because 409569381 - 2¹ = 409569379 is a prime.

It is a super-2 number, since 2×409569381² = 335494155705446322, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (409569383) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 1750180 + ... + 1750413.

Almost surely, 2^409569381 is an apocalyptic number.

It is an amenable number.

409569381 is a deficient number, since it is larger than the sum of its proper divisors (227538727).

409569381 is a wasteful number, since it uses less digits than its factorization.

409569381 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3500612 (or 3500609 counting only the distinct ones).

The product of its (nonzero) digits is 233280, while the sum is 45.

The square root of 409569381 is about 20237.8205595365. The cubic root of 409569381 is about 742.6357076033.

The spelling of 409569381 in words is "four hundred nine million, five hundred sixty-nine thousand, three hundred eighty-one".