1564421 has 2 divisors, whose sum is σ = 1564422. Its totient is φ = 1564420.

The previous prime is 1564417. The next prime is 1564427. The reversal of 1564421 is 1244651.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1221025 + 343396 = 1105^2 + 586^2 .

It is a cyclic number.

It is not a de Polignac number, because 1564421 - 2² = 1564417 is a prime.

It is a Sophie Germain prime.

It is a Curzon number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1564427) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 782210 + 782211.

It is an arithmetic number, because the mean of its divisors is an integer number (782211).

2^1564421 is an apocalyptic number.

It is an amenable number.

1564421 is a deficient number, since it is larger than the sum of its proper divisors (1).

1564421 is an equidigital number, since it uses as much as digits as its factorization.

1564421 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 960, while the sum is 23.

The square root of 1564421 is about 1250.7681639696. The cubic root of 1564421 is about 116.0872559899.

The spelling of 1564421 in words is "one million, five hundred sixty-four thousand, four hundred twenty-one".