1240271999 has 2 divisors, whose sum is σ = 1240272000. Its totient is φ = 1240271998.

The previous prime is 1240271993. The next prime is 1240272001. The reversal of 1240271999 is 9991720421.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1240271999 is a prime.

It is a Sophie Germain prime.

Together with 1240272001, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1240271993) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 620135999 + 620136000.

It is an arithmetic number, because the mean of its divisors is an integer number (620136000).

Almost surely, 2^1240271999 is an apocalyptic number.

1240271999 is a deficient number, since it is larger than the sum of its proper divisors (1).

1240271999 is an equidigital number, since it uses as much as digits as its factorization.

1240271999 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 81648, while the sum is 44.

The square root of 1240271999 is about 35217.4956378218. The cubic root of 1240271999 is about 1074.4156186355.

The spelling of 1240271999 in words is "one billion, two hundred forty million, two hundred seventy-one thousand, nine hundred ninety-nine".