56661031 has 8 divisors (see below), whose sum is σ = 64921760. Its totient is φ = 48441888.

The previous prime is 56661019. The next prime is 56661043. The reversal of 56661031 is 13016665.

It is an interprime number because it is at equal distance from previous prime (56661019) and next prime (56661043).

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 56661031 - 2²¹ = 54563879 is a prime.

It is a super-2 number, since 2×56661031² = 6420944867965922, 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 (56661001) 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, 7416 + ... + 12973.

It is an arithmetic number, because the mean of its divisors is an integer number (8115220).

Almost surely, 2^56661031 is an apocalyptic number.

56661031 is a deficient number, since it is larger than the sum of its proper divisors (8260729).

56661031 is a wasteful number, since it uses less digits than its factorization.

56661031 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 20793.

The product of its (nonzero) digits is 3240, while the sum is 28.

The square root of 56661031 is about 7527.3521905116. The cubic root of 56661031 is about 384.0857171747.

Adding to 56661031 its reverse (13016665), we get a palindrome (69677696).

The spelling of 56661031 in words is "fifty-six million, six hundred sixty-one thousand, thirty-one".