1240315651 has 2 divisors, whose sum is σ = 1240315652. Its totient is φ = 1240315650.

The previous prime is 1240315613. The next prime is 1240315669. The reversal of 1240315651 is 1565130421.

It is a strong prime.

It is an emirp because it is prime and its reverse (1565130421) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 1240315651 - 2¹¹ = 1240313603 is a prime.

It is not a weakly prime, because it can be changed into another prime (1240319651) 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, 620157825 + 620157826.

It is an arithmetic number, because the mean of its divisors is an integer number (620157826).

Almost surely, 2^1240315651 is an apocalyptic number.

1240315651 is a deficient number, since it is larger than the sum of its proper divisors (1).

1240315651 is an equidigital number, since it uses as much as digits as its factorization.

1240315651 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 3600, while the sum is 28.

The square root of 1240315651 is about 35218.1153811501. The cubic root of 1240315651 is about 1074.4282233546.

The spelling of 1240315651 in words is "one billion, two hundred forty million, three hundred fifteen thousand, six hundred fifty-one".