1564240241 has 4 divisors (see below), whose sum is σ = 1602392484. Its totient is φ = 1526088000.

The previous prime is 1564240219. The next prime is 1564240243. The reversal of 1564240241 is 1420424651.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 1420424651 = 71 ⋅20005981.

It can be written as a sum of positive squares in 2 ways, for example, as 639837025 + 924403216 = 25295^2 + 30404^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1564240241 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1564240243) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 19076060 + ... + 19076141.

It is an arithmetic number, because the mean of its divisors is an integer number (400598121).

Almost surely, 2^1564240241 is an apocalyptic number.

It is an amenable number.

1564240241 is a deficient number, since it is larger than the sum of its proper divisors (38152243).

1564240241 is an equidigital number, since it uses as much as digits as its factorization.

1564240241 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 38152242.

The product of its (nonzero) digits is 7680, while the sum is 29.

The square root of 1564240241 is about 39550.4771273369. The cubic root of 1564240241 is about 1160.8278476710.

Adding to 1564240241 its reverse (1420424651), we get a palindrome (2984664892).

The spelling of 1564240241 in words is "one billion, five hundred sixty-four million, two hundred forty thousand, two hundred forty-one".