56623289 has 2 divisors, whose sum is σ = 56623290. Its totient is φ = 56623288.

The previous prime is 56623279. The next prime is 56623291. The reversal of 56623289 is 98232665.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 37613689 + 19009600 = 6133^2 + 4360^2 .

It is a cyclic number.

It is not a de Polignac number, because 56623289 - 2¹² = 56619193 is a prime.

Together with 56623291, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (56623219) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 28311644 + 28311645.

It is an arithmetic number, because the mean of its divisors is an integer number (28311645).

Almost surely, 2^56623289 is an apocalyptic number.

It is an amenable number.

56623289 is a deficient number, since it is larger than the sum of its proper divisors (1).

56623289 is an equidigital number, since it uses as much as digits as its factorization.

56623289 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 155520, while the sum is 41.

The square root of 56623289 is about 7524.8447824523. The cubic root of 56623289 is about 384.0004182034. Note that the first 3 decimals are identical.

The spelling of 56623289 in words is "fifty-six million, six hundred twenty-three thousand, two hundred eighty-nine".