1240201243 has 2 divisors, whose sum is σ = 1240201244. Its totient is φ = 1240201242.

The previous prime is 1240201223. The next prime is 1240201253. The reversal of 1240201243 is 3421020421.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 1240201243 - 2¹⁷ = 1240070171 is a prime.

It is a super-3 number, since 3×1240201243³ (a number of 28 digits) contains 333 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 1240201243.

It is not a weakly prime, because it can be changed into another prime (1240201213) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 620100621 + 620100622.

It is an arithmetic number, because the mean of its divisors is an integer number (620100622).

Almost surely, 2^1240201243 is an apocalyptic number.

1240201243 is a deficient number, since it is larger than the sum of its proper divisors (1).

1240201243 is an equidigital number, since it uses as much as digits as its factorization.

1240201243 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 384, while the sum is 19.

The square root of 1240201243 is about 35216.4910659765. The cubic root of 1240201243 is about 1074.3951868815.

Adding to 1240201243 its reverse (3421020421), we get a palindrome (4661221664).

The spelling of 1240201243 in words is "one billion, two hundred forty million, two hundred one thousand, two hundred forty-three".