1240457149 has 2 divisors, whose sum is σ = 1240457150. Its totient is φ = 1240457148.

The previous prime is 1240457111. The next prime is 1240457171. The reversal of 1240457149 is 9417540421.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1106892900 + 133564249 = 33270^2 + 11557^2 .

It is an emirp because it is prime and its reverse (9417540421) is a distict prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1240457149 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1240452149) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 620228574 + 620228575.

It is an arithmetic number, because the mean of its divisors is an integer number (620228575).

Almost surely, 2^1240457149 is an apocalyptic number.

It is an amenable number.

1240457149 is a deficient number, since it is larger than the sum of its proper divisors (1).

1240457149 is an equidigital number, since it uses as much as digits as its factorization.

1240457149 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 40320, while the sum is 37.

The square root of 1240457149 is about 35220.1242047782. The cubic root of 1240457149 is about 1074.4690795306.

The spelling of 1240457149 in words is "one billion, two hundred forty million, four hundred fifty-seven thousand, one hundred forty-nine".