138898841 has 2 divisors, whose sum is σ = 138898842. Its totient is φ = 138898840.

The previous prime is 138898831. The next prime is 138898847. The reversal of 138898841 is 148898831.

138898841 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 129868816 + 9030025 = 11396^2 + 3005^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-138898841 is a prime.

It is a super-2 number, since 2×138898841² = 38585776062286562, which contains 22 as substring.

It is a Chen prime.

It is a self number, because there is not a number n which added to its sum of digits gives 138898841.

It is not a weakly prime, because it can be changed into another prime (138898847) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 69449420 + 69449421.

It is an arithmetic number, because the mean of its divisors is an integer number (69449421).

Almost surely, 2^138898841 is an apocalyptic number.

It is an amenable number.

138898841 is a deficient number, since it is larger than the sum of its proper divisors (1).

138898841 is an equidigital number, since it uses as much as digits as its factorization.

138898841 is an evil number, because the sum of its binary digits is even.

The product of its digits is 442368, while the sum is 50.

The square root of 138898841 is about 11785.5352445275. The cubic root of 138898841 is about 517.8844534395.

The spelling of 138898841 in words is "one hundred thirty-eight million, eight hundred ninety-eight thousand, eight hundred forty-one".