1240402511 has 2 divisors, whose sum is σ = 1240402512. Its totient is φ = 1240402510.

The previous prime is 1240402483. The next prime is 1240402519. The reversal of 1240402511 is 1152040421.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1240402511 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1240402519) 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 as a sum of consecutive naturals, namely, 620201255 + 620201256.

It is an arithmetic number, because the mean of its divisors is an integer number (620201256).

Almost surely, 2^1240402511 is an apocalyptic number.

1240402511 is a deficient number, since it is larger than the sum of its proper divisors (1).

1240402511 is an equidigital number, since it uses as much as digits as its factorization.

1240402511 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 320, while the sum is 20.

The square root of 1240402511 is about 35219.3485317375. The cubic root of 1240402511 is about 1074.4533037060.

Adding to 1240402511 its reverse (1152040421), we get a palindrome (2392442932).

The spelling of 1240402511 in words is "one billion, two hundred forty million, four hundred two thousand, five hundred eleven".