1563421 has 2 divisors, whose sum is σ = 1563422. Its totient is φ = 1563420.

The previous prime is 1563413. The next prime is 1563427. The reversal of 1563421 is 1243651.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 940900 + 622521 = 970^2 + 789^2 .

It is a cyclic number.

It is not a de Polignac number, because 1563421 - 2³ = 1563413 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 1563392 and 1563401.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1563427) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 781710 + 781711.

It is an arithmetic number, because the mean of its divisors is an integer number (781711).

2^1563421 is an apocalyptic number.

It is an amenable number.

1563421 is a deficient number, since it is larger than the sum of its proper divisors (1).

1563421 is an equidigital number, since it uses as much as digits as its factorization.

1563421 is an evil number, because the sum of its binary digits is even.

The product of its digits is 720, while the sum is 22.

The square root of 1563421 is about 1250.3683457286. The cubic root of 1563421 is about 116.0625158465.

It can be divided in two parts, 15 and 63421, that added together give a palindrome (63436).

The spelling of 1563421 in words is "one million, five hundred sixty-three thousand, four hundred twenty-one".