1564140521 has 2 divisors, whose sum is σ = 1564140522. Its totient is φ = 1564140520.

The previous prime is 1564140503. The next prime is 1564140533. The reversal of 1564140521 is 1250414651.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1296360025 + 267780496 = 36005^2 + 16364^2 .

It is a cyclic number.

It is not a de Polignac number, because 1564140521 - 2¹⁰ = 1564139497 is a prime.

It is not a weakly prime, because it can be changed into another prime (1564143521) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 782070260 + 782070261.

It is an arithmetic number, because the mean of its divisors is an integer number (782070261).

Almost surely, 2^1564140521 is an apocalyptic number.

It is an amenable number.

1564140521 is a deficient number, since it is larger than the sum of its proper divisors (1).

1564140521 is an equidigital number, since it uses as much as digits as its factorization.

1564140521 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 4800, while the sum is 29.

The square root of 1564140521 is about 39549.2164397729. The cubic root of 1564140521 is about 1160.8031796330.

The spelling of 1564140521 in words is "one billion, five hundred sixty-four million, one hundred forty thousand, five hundred twenty-one".