1240436531 has 2 divisors, whose sum is σ = 1240436532. Its totient is φ = 1240436530.

The previous prime is 1240436453. The next prime is 1240436611. The reversal of 1240436531 is 1356340421.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 1240436531 - 2¹⁸ = 1240174387 is a prime.

It is a super-2 number, since 2×1240436531² = 3077365574878627922, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 1240436494 and 1240436503.

It is not a weakly prime, because it can be changed into another prime (1240436231) 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, 620218265 + 620218266.

It is an arithmetic number, because the mean of its divisors is an integer number (620218266).

Almost surely, 2^1240436531 is an apocalyptic number.

1240436531 is a deficient number, since it is larger than the sum of its proper divisors (1).

1240436531 is an equidigital number, since it uses as much as digits as its factorization.

1240436531 is an odious number, because the sum of its binary digits is odd.

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

The square root of 1240436531 is about 35219.8315015844. The cubic root of 1240436531 is about 1074.4631264764.

Adding to 1240436531 its reverse (1356340421), we get a palindrome (2596776952).

The spelling of 1240436531 in words is "one billion, two hundred forty million, four hundred thirty-six thousand, five hundred thirty-one".