1240313551 has 2 divisors, whose sum is σ = 1240313552. Its totient is φ = 1240313550.

The previous prime is 1240313527. The next prime is 1240313561. The reversal of 1240313551 is 1553130421.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 1240313551 - 2⁷ = 1240313423 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1240313561) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 620156775 + 620156776.

It is an arithmetic number, because the mean of its divisors is an integer number (620156776).

Almost surely, 2^1240313551 is an apocalyptic number.

1240313551 is a deficient number, since it is larger than the sum of its proper divisors (1).

1240313551 is an equidigital number, since it uses as much as digits as its factorization.

1240313551 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1800, while the sum is 25.

The square root of 1240313551 is about 35218.0855669356. The cubic root of 1240313551 is about 1074.4276169765.

Adding to 1240313551 its reverse (1553130421), we get a palindrome (2793443972).

The spelling of 1240313551 in words is "one billion, two hundred forty million, three hundred thirteen thousand, five hundred fifty-one".