138181853 has 2 divisors, whose sum is σ = 138181854. Its totient is φ = 138181852.

The previous prime is 138181829. The next prime is 138181859. The reversal of 138181853 is 358181831.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 136843204 + 1338649 = 11698^2 + 1157^2 .

It is a cyclic number.

It is not a de Polignac number, because 138181853 - 2¹⁸ = 137919709 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (138181859) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 69090926 + 69090927.

It is an arithmetic number, because the mean of its divisors is an integer number (69090927).

Almost surely, 2^138181853 is an apocalyptic number.

It is an amenable number.

138181853 is a deficient number, since it is larger than the sum of its proper divisors (1).

138181853 is an equidigital number, since it uses as much as digits as its factorization.

138181853 is an evil number, because the sum of its binary digits is even.

The product of its digits is 23040, while the sum is 38.

The square root of 138181853 is about 11755.0777538900. The cubic root of 138181853 is about 516.9918189627.

The spelling of 138181853 in words is "one hundred thirty-eight million, one hundred eighty-one thousand, eight hundred fifty-three".