53556989 has 2 divisors, whose sum is σ = 53556990. Its totient is φ = 53556988.

The previous prime is 53556983. The next prime is 53557033. The reversal of 53556989 is 98965535.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 47844889 + 5712100 = 6917^2 + 2390^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-53556989 is a prime.

It is a super-2 number, since 2×53556989² = 5736702141492242, which contains 22 as substring.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (53556983) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 26778494 + 26778495.

It is an arithmetic number, because the mean of its divisors is an integer number (26778495).

Almost surely, 2^53556989 is an apocalyptic number.

It is an amenable number.

53556989 is a deficient number, since it is larger than the sum of its proper divisors (1).

53556989 is an equidigital number, since it uses as much as digits as its factorization.

53556989 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1458000, while the sum is 50.

The square root of 53556989 is about 7318.2640701194. The cubic root of 53556989 is about 376.9398478564.

It can be divided in two parts, 53556 and 989, that added together give a palindrome (54545).

The spelling of 53556989 in words is "fifty-three million, five hundred fifty-six thousand, nine hundred eighty-nine".