3573991 has 4 divisors (see below), whose sum is σ = 3578800. Its totient is φ = 3569184.

The previous prime is 3573979. The next prime is 3574013. The reversal of 3573991 is 1993753.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 1993753 = 509 ⋅3917.

It is a cyclic number.

It is not a de Polignac number, because 3573991 - 2¹³ = 3565799 is a prime.

It is the 1891-st Hogben number.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 3573991.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (3573971) by changing a digit.

It is a nontrivial repunit in base 1890.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1026 + ... + 2863.

It is an arithmetic number, because the mean of its divisors is an integer number (894700).

Almost surely, 2^3573991 is an apocalyptic number.

3573991 is a deficient number, since it is larger than the sum of its proper divisors (4809).

3573991 is an equidigital number, since it uses as much as digits as its factorization.

3573991 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4808.

The product of its digits is 25515, while the sum is 37.

The square root of 3573991 is about 1890.5001983602. The cubic root of 3573991 is about 152.8919025135.

The spelling of 3573991 in words is "three million, five hundred seventy-three thousand, nine hundred ninety-one".