1259242639 has 2 divisors, whose sum is σ = 1259242640. Its totient is φ = 1259242638.

The previous prime is 1259242637. The next prime is 1259242687. The reversal of 1259242639 is 9362429521.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 1259242639 - 2¹ = 1259242637 is a prime.

Together with 1259242637, it forms a pair of twin primes.

It is a junction number, because it is equal to n+sod(n) for n = 1259242595 and 1259242604.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1259242631) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 629621319 + 629621320.

It is an arithmetic number, because the mean of its divisors is an integer number (629621320).

Almost surely, 2^1259242639 is an apocalyptic number.

1259242639 is a deficient number, since it is larger than the sum of its proper divisors (1).

1259242639 is an equidigital number, since it uses as much as digits as its factorization.

1259242639 is an evil number, because the sum of its binary digits is even.

The product of its digits is 233280, while the sum is 43.

The square root of 1259242639 is about 35485.8089804925. The cubic root of 1259242639 is about 1079.8658495354.

The spelling of 1259242639 in words is "one billion, two hundred fifty-nine million, two hundred forty-two thousand, six hundred thirty-nine".