565403989 has 2 divisors, whose sum is σ = 565403990. Its totient is φ = 565403988.

The previous prime is 565403953. The next prime is 565404013. The reversal of 565403989 is 989304565.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 320231025 + 245172964 = 17895^2 + 15658^2 .

It is a cyclic number.

It is not a de Polignac number, because 565403989 - 2²⁵ = 531849557 is a prime.

It is a super-2 number, since 2×565403989² = 639363341554224242, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (565401989) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 282701994 + 282701995.

It is an arithmetic number, because the mean of its divisors is an integer number (282701995).

Almost surely, 2^565403989 is an apocalyptic number.

It is an amenable number.

565403989 is a deficient number, since it is larger than the sum of its proper divisors (1).

565403989 is an equidigital number, since it uses as much as digits as its factorization.

565403989 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1166400, while the sum is 49.

The square root of 565403989 is about 23778.2251019709. The cubic root of 565403989 is about 826.8999316971.

It can be divided in two parts, 56 and 5403989, that added together give a palindrome (5404045).

The spelling of 565403989 in words is "five hundred sixty-five million, four hundred three thousand, nine hundred eighty-nine".