1568561 has 2 divisors, whose sum is σ = 1568562. Its totient is φ = 1568560.

The previous prime is 1568543. The next prime is 1568563. The reversal of 1568561 is 1658651.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1547536 + 21025 = 1244^2 + 145^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1568561 is a prime.

It is a super-2 number, since 2×1568561² = 4920767221442, which contains 22 as substring.

Together with 1568563, 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 (1568563) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 784280 + 784281.

It is an arithmetic number, because the mean of its divisors is an integer number (784281).

2^1568561 is an apocalyptic number.

It is an amenable number.

1568561 is a deficient number, since it is larger than the sum of its proper divisors (1).

1568561 is an equidigital number, since it uses as much as digits as its factorization.

1568561 is an evil number, because the sum of its binary digits is even.

The product of its digits is 7200, while the sum is 32.

The square root of 1568561 is about 1252.4220534628. The cubic root of 1568561 is about 116.1895681587.

The spelling of 1568561 in words is "one million, five hundred sixty-eight thousand, five hundred sixty-one".