18139711 has 2 divisors, whose sum is σ = 18139712. Its totient is φ = 18139710.

The previous prime is 18139633. The next prime is 18139729. The reversal of 18139711 is 11793181.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-18139711 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (18139741) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9069855 + 9069856.

It is an arithmetic number, because the mean of its divisors is an integer number (9069856).

Almost surely, 2^18139711 is an apocalyptic number.

18139711 is a deficient number, since it is larger than the sum of its proper divisors (1).

18139711 is an equidigital number, since it uses as much as digits as its factorization.

18139711 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 1512, while the sum is 31.

The square root of 18139711 is about 4259.0739603815. The cubic root of 18139711 is about 262.7504415614.

The spelling of 18139711 in words is "eighteen million, one hundred thirty-nine thousand, seven hundred eleven".