5617661 has 4 divisors (see below), whose sum is σ = 6420192. Its totient is φ = 4815132.

The previous prime is 5617657. The next prime is 5617679. The reversal of 5617661 is 1667165.

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: 1667165 = 5 ⋅333433.

It is not a de Polignac number, because 5617661 - 2² = 5617657 is a prime.

It is a super-2 number, since 2×5617661² = 63116230221842, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (5617691) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 401255 + ... + 401268.

It is an arithmetic number, because the mean of its divisors is an integer number (1605048).

Almost surely, 2^5617661 is an apocalyptic number.

It is an amenable number.

5617661 is a deficient number, since it is larger than the sum of its proper divisors (802531).

5617661 is an equidigital number, since it uses as much as digits as its factorization.

5617661 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 802530.

The product of its digits is 7560, while the sum is 32.

The square root of 5617661 is about 2370.1605430856. The cubic root of 5617661 is about 177.7672862588.

The spelling of 5617661 in words is "five million, six hundred seventeen thousand, six hundred sixty-one".