5661913 has 4 divisors (see below), whose sum is σ = 5725620. Its totient is φ = 5598208.

The previous prime is 5661911. The next prime is 5661923. The reversal of 5661913 is 3191665.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 2082249 + 3579664 = 1443^2 + 1892^2 .

It is a cyclic number.

It is not a de Polignac number, because 5661913 - 2¹ = 5661911 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (5661911) 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, 31720 + ... + 31897.

It is an arithmetic number, because the mean of its divisors is an integer number (1431405).

Almost surely, 2^5661913 is an apocalyptic number.

It is an amenable number.

5661913 is a deficient number, since it is larger than the sum of its proper divisors (63707).

5661913 is an equidigital number, since it uses as much as digits as its factorization.

5661913 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 63706.

The product of its digits is 4860, while the sum is 31.

The square root of 5661913 is about 2379.4774636462. The cubic root of 5661913 is about 178.2328413554.

The spelling of 5661913 in words is "five million, six hundred sixty-one thousand, nine hundred thirteen".