1240103209 has 2 divisors, whose sum is σ = 1240103210. Its totient is φ = 1240103208.

The previous prime is 1240103203. The next prime is 1240103231. The reversal of 1240103209 is 9023010421.

It is an a-pointer prime, because the next prime (1240103231) can be obtained adding 1240103209 to its sum of digits (22).

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1119103209 + 121000000 = 33453^2 + 11000^2 .

It is a cyclic number.

It is not a de Polignac number, because 1240103209 - 2¹⁵ = 1240070441 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 1240103209.

It is not a weakly prime, because it can be changed into another prime (1240103203) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 620051604 + 620051605.

It is an arithmetic number, because the mean of its divisors is an integer number (620051605).

Almost surely, 2^1240103209 is an apocalyptic number.

It is an amenable number.

1240103209 is a deficient number, since it is larger than the sum of its proper divisors (1).

1240103209 is an equidigital number, since it uses as much as digits as its factorization.

1240103209 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 432, while the sum is 22.

The square root of 1240103209 is about 35215.0991621492. The cubic root of 1240103209 is about 1074.3668769509.

The spelling of 1240103209 in words is "one billion, two hundred forty million, one hundred three thousand, two hundred nine".