3681975409 has 4 divisors (see below), whose sum is σ = 4207971904. Its totient is φ = 3155978916.

The previous prime is 3681975403. The next prime is 3681975443. The reversal of 3681975409 is 9045791863.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 9045791863 = 5939 ⋅1523117.

It is a cyclic number.

It is not a de Polignac number, because 3681975409 - 2⁷ = 3681975281 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (3681975403) 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, 262998237 + ... + 262998250.

It is an arithmetic number, because the mean of its divisors is an integer number (1051992976).

Almost surely, 2^3681975409 is an apocalyptic number.

It is an amenable number.

3681975409 is a deficient number, since it is larger than the sum of its proper divisors (525996495).

3681975409 is an equidigital number, since it uses as much as digits as its factorization.

3681975409 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 525996494.

The product of its (nonzero) digits is 1632960, while the sum is 52.

The square root of 3681975409 is about 60679.2831945138. The cubic root of 3681975409 is about 1544.1647274795.

The spelling of 3681975409 in words is "three billion, six hundred eighty-one million, nine hundred seventy-five thousand, four hundred nine".