1240412291 has 2 divisors, whose sum is σ = 1240412292. Its totient is φ = 1240412290.

The previous prime is 1240412281. The next prime is 1240412311. The reversal of 1240412291 is 1922140421.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 1240412291 - 2¹⁸ = 1240150147 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 1240412291.

It is not a weakly prime, because it can be changed into another prime (1240412281) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 620206145 + 620206146.

It is an arithmetic number, because the mean of its divisors is an integer number (620206146).

Almost surely, 2^1240412291 is an apocalyptic number.

1240412291 is a deficient number, since it is larger than the sum of its proper divisors (1).

1240412291 is an equidigital number, since it uses as much as digits as its factorization.

1240412291 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1152, while the sum is 26.

The square root of 1240412291 is about 35219.4873755993. The cubic root of 1240412291 is about 1074.4561275543.

The spelling of 1240412291 in words is "one billion, two hundred forty million, four hundred twelve thousand, two hundred ninety-one".