138431803 has 2 divisors, whose sum is σ = 138431804. Its totient is φ = 138431802.

The previous prime is 138431791. The next prime is 138431809. The reversal of 138431803 is 308134831.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 138431803 - 2⁹ = 138431291 is a prime.

It is not a weakly prime, because it can be changed into another prime (138431809) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 69215901 + 69215902.

It is an arithmetic number, because the mean of its divisors is an integer number (69215902).

Almost surely, 2^138431803 is an apocalyptic number.

138431803 is a deficient number, since it is larger than the sum of its proper divisors (1).

138431803 is an equidigital number, since it uses as much as digits as its factorization.

138431803 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 6912, while the sum is 31.

The square root of 138431803 is about 11765.7045262917. The cubic root of 138431803 is about 517.3033511120.

The spelling of 138431803 in words is "one hundred thirty-eight million, four hundred thirty-one thousand, eight hundred three".