13431239 has 2 divisors, whose sum is σ = 13431240. Its totient is φ = 13431238.

The previous prime is 13431217. The next prime is 13431251. The reversal of 13431239 is 93213431.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 13431239 - 2¹² = 13427143 is a prime.

It is a zygodrome in base 2.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (13431739) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6715619 + 6715620.

It is an arithmetic number, because the mean of its divisors is an integer number (6715620).

Almost surely, 2^13431239 is an apocalyptic number.

13431239 is a deficient number, since it is larger than the sum of its proper divisors (1).

13431239 is an equidigital number, since it uses as much as digits as its factorization.

13431239 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1944, while the sum is 26.

The square root of 13431239 is about 3664.8654818424. The cubic root of 13431239 is about 237.7052054722.

The spelling of 13431239 in words is "thirteen million, four hundred thirty-one thousand, two hundred thirty-nine".