56989 has 2 divisors, whose sum is σ = 56990. Its totient is φ = 56988.

The previous prime is 56983. The next prime is 56993. The reversal of 56989 is 98965.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 55225 + 1764 = 235^2 + 42^2 .

It is a cyclic number.

It is not a de Polignac number, because 56989 - 2⁵ = 56957 is a prime.

It is a super-2 number, since 2×56989² = 6495492242, which contains 22 as substring.

It is an alternating number because its digits alternate between odd and even.

56989 is a lucky number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (56983) 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 as a sum of consecutive naturals, namely, 28494 + 28495.

It is an arithmetic number, because the mean of its divisors is an integer number (28495).

2⁵⁶⁹⁸⁹ is an apocalyptic number.

It is an amenable number.

56989 is a deficient number, since it is larger than the sum of its proper divisors (1).

56989 is an equidigital number, since it uses as much as digits as its factorization.

56989 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 19440, while the sum is 37.

The square root of 56989 is about 238.7236896498. The cubic root of 56989 is about 38.4825355095.

The spelling of 56989 in words is "fifty-six thousand, nine hundred eighty-nine".