5615661 has 16 divisors (see below), whose sum is σ = 7992000. Its totient is φ = 3495168.

The previous prime is 5615653. The next prime is 5615669. The reversal of 5615661 is 1665165.

It is an interprime number because it is at equal distance from previous prime (5615653) and next prime (5615669).

It is not a de Polignac number, because 5615661 - 2³ = 5615653 is a prime.

It is an Ulam number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (5615669) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 7230 + ... + 7968.

It is an arithmetic number, because the mean of its divisors is an integer number (499500).

Almost surely, 2^5615661 is an apocalyptic number.

5615661 is a gapful number since it is divisible by the number (51) formed by its first and last digit.

It is an amenable number.

5615661 is a deficient number, since it is larger than the sum of its proper divisors (2376339).

5615661 is a wasteful number, since it uses less digits than its factorization.

5615661 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 908.

The product of its digits is 5400, while the sum is 30.

The square root of 5615661 is about 2369.7385931786. The cubic root of 5615661 is about 177.7461875148.

The spelling of 5615661 in words is "five million, six hundred fifteen thousand, six hundred sixty-one".