1240334561 has 4 divisors (see below), whose sum is σ = 1241189652. Its totient is φ = 1239479472.

The previous prime is 1240334539. The next prime is 1240334597. The reversal of 1240334561 is 1654330421.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 1166632336 + 73702225 = 34156^2 + 8585^2 .

It is a cyclic number.

It is not a de Polignac number, because 1240334561 - 2¹⁸ = 1240072417 is a prime.

It is a super-2 number, since 2×1240334561² = 3076859646422125442, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1240334531) 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 in 3 ways as a sum of consecutive naturals, for example, 425366 + ... + 428271.

It is an arithmetic number, because the mean of its divisors is an integer number (310297413).

Almost surely, 2^1240334561 is an apocalyptic number.

It is an amenable number.

1240334561 is a deficient number, since it is larger than the sum of its proper divisors (855091).

1240334561 is an equidigital number, since it uses as much as digits as its factorization.

1240334561 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 855090.

The product of its (nonzero) digits is 8640, while the sum is 29.

The square root of 1240334561 is about 35218.3838499157. The cubic root of 1240334561 is about 1074.4336836137.

Adding to 1240334561 its reverse (1654330421), we get a palindrome (2894664982).

It can be divided in two parts, 12403 and 34561, that added together give a palindrome (46964).

The spelling of 1240334561 in words is "one billion, two hundred forty million, three hundred thirty-four thousand, five hundred sixty-one".