1240365121 has 2 divisors, whose sum is σ = 1240365122. Its totient is φ = 1240365120.

The previous prime is 1240365107. The next prime is 1240365131. The reversal of 1240365121 is 1215630421.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 881793025 + 358572096 = 29695^2 + 18936^2 .

It is a cyclic number.

It is not a de Polignac number, because 1240365121 - 2⁵ = 1240365089 is a prime.

It is not a weakly prime, because it can be changed into another prime (1240365131) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 620182560 + 620182561.

It is an arithmetic number, because the mean of its divisors is an integer number (620182561).

Almost surely, 2^1240365121 is an apocalyptic number.

It is an amenable number.

1240365121 is a deficient number, since it is larger than the sum of its proper divisors (1).

1240365121 is an equidigital number, since it uses as much as digits as its factorization.

1240365121 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1440, while the sum is 25.

The square root of 1240365121 is about 35218.8177115587. The cubic root of 1240365121 is about 1074.4425076909.

Adding to 1240365121 its reverse (1215630421), we get a palindrome (2455995542).

The spelling of 1240365121 in words is "one billion, two hundred forty million, three hundred sixty-five thousand, one hundred twenty-one".