5661481 has 8 divisors (see below), whose sum is σ = 6645440. Its totient is φ = 4721328.

The previous prime is 5661457. The next prime is 5661497. The reversal of 5661481 is 1841665.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 5661481 - 2¹⁵ = 5628713 is a prime.

It is a super-2 number, since 2×5661481² = 64104734226722, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (5661401) 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 7 ways as a sum of consecutive naturals, for example, 10671 + ... + 11188.

It is an arithmetic number, because the mean of its divisors is an integer number (830680).

Almost surely, 2^5661481 is an apocalyptic number.

It is an amenable number.

5661481 is a deficient number, since it is larger than the sum of its proper divisors (983959).

5661481 is a wasteful number, since it uses less digits than its factorization.

5661481 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 21903.

The product of its digits is 5760, while the sum is 31.

The square root of 5661481 is about 2379.3866856818. The cubic root of 5661481 is about 178.2283082264.

The spelling of 5661481 in words is "five million, six hundred sixty-one thousand, four hundred eighty-one".