1240131239 has 2 divisors, whose sum is σ = 1240131240. Its totient is φ = 1240131238.

The previous prime is 1240131229. The next prime is 1240131241. The reversal of 1240131239 is 9321310421.

It is a strong prime.

It is an emirp because it is prime and its reverse (9321310421) is a distict prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1240131239 is a prime.

Together with 1240131241, 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 (1240131229) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 620065619 + 620065620.

It is an arithmetic number, because the mean of its divisors is an integer number (620065620).

Almost surely, 2^1240131239 is an apocalyptic number.

1240131239 is a deficient number, since it is larger than the sum of its proper divisors (1).

1240131239 is an equidigital number, since it uses as much as digits as its factorization.

1240131239 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1296, while the sum is 26.

The square root of 1240131239 is about 35215.4971425933. The cubic root of 1240131239 is about 1074.3749715129.

The spelling of 1240131239 in words is "one billion, two hundred forty million, one hundred thirty-one thousand, two hundred thirty-nine".