1240036531 has 4 divisors (see below), whose sum is σ = 1240868592. Its totient is φ = 1239204472.

The previous prime is 1240036481. The next prime is 1240036547. The reversal of 1240036531 is 1356300421.

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

It is a cyclic number.

It is not a de Polignac number, because 1240036531 - 2²⁷ = 1105818803 is a prime.

It is a super-2 number, since 2×1240036531² = 3075381196429027922, which contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 1240036496 and 1240036505.

It is not an unprimeable number, because it can be changed into a prime (1240036591) 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, 413791 + ... + 416776.

It is an arithmetic number, because the mean of its divisors is an integer number (310217148).

Almost surely, 2^1240036531 is an apocalyptic number.

1240036531 is a deficient number, since it is larger than the sum of its proper divisors (832061).

1240036531 is an equidigital number, since it uses as much as digits as its factorization.

1240036531 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 832060.

The product of its (nonzero) digits is 2160, while the sum is 25.

The square root of 1240036531 is about 35214.1524248419. The cubic root of 1240036531 is about 1074.3476210487.

Adding to 1240036531 its reverse (1356300421), we get a palindrome (2596336952).

The spelling of 1240036531 in words is "one billion, two hundred forty million, thirty-six thousand, five hundred thirty-one".