56143661 has 6 divisors (see below), whose sum is σ = 65310030. Its totient is φ = 48123096.

The previous prime is 56143627. The next prime is 56143663. The reversal of 56143661 is 16634165.

It can be written as a sum of positive squares in only one way, i.e., 53202436 + 2941225 = 7294^2 + 1715^2 .

It is not a de Polignac number, because 56143661 - 2⁶ = 56143597 is a prime.

It is a super-2 number, since 2×56143661² = 6304221340965842, which contains 22 as substring.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (56143663) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 572846 + ... + 572943.

It is an arithmetic number, because the mean of its divisors is an integer number (10885005).

Almost surely, 2^56143661 is an apocalyptic number.

It is an amenable number.

56143661 is a deficient number, since it is larger than the sum of its proper divisors (9166369).

56143661 is a wasteful number, since it uses less digits than its factorization.

56143661 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1145803 (or 1145796 counting only the distinct ones).

The product of its digits is 12960, while the sum is 32.

The square root of 56143661 is about 7492.9073796491. The cubic root of 56143661 is about 382.9131162462.

The spelling of 56143661 in words is "fifty-six million, one hundred forty-three thousand, six hundred sixty-one".