1240523551 has 2 divisors, whose sum is σ = 1240523552. Its totient is φ = 1240523550.

The previous prime is 1240523539. The next prime is 1240523567. The reversal of 1240523551 is 1553250421.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1240523551 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1240523351) 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, 620261775 + 620261776.

It is an arithmetic number, because the mean of its divisors is an integer number (620261776).

Almost surely, 2^1240523551 is an apocalyptic number.

1240523551 is a deficient number, since it is larger than the sum of its proper divisors (1).

1240523551 is an equidigital number, since it uses as much as digits as its factorization.

1240523551 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 6000, while the sum is 28.

The square root of 1240523551 is about 35221.0668634555. The cubic root of 1240523551 is about 1074.4882513934.

Adding to 1240523551 its reverse (1553250421), we get a palindrome (2793773972).

The spelling of 1240523551 in words is "one billion, two hundred forty million, five hundred twenty-three thousand, five hundred fifty-one".