13121231239 has 2 divisors, whose sum is σ = 13121231240. Its totient is φ = 13121231238.

The previous prime is 13121231141. The next prime is 13121231257. The reversal of 13121231239 is 93213212131.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 13121231239 - 2¹³ = 13121223047 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (13121231339) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6560615619 + 6560615620.

It is an arithmetic number, because the mean of its divisors is an integer number (6560615620).

Almost surely, 2^13121231239 is an apocalyptic number.

13121231239 is a deficient number, since it is larger than the sum of its proper divisors (1).

13121231239 is an equidigital number, since it uses as much as digits as its factorization.

13121231239 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 1944, while the sum is 28.

The spelling of 13121231239 in words is "thirteen billion, one hundred twenty-one million, two hundred thirty-one thousand, two hundred thirty-nine".