138848641 has 2 divisors, whose sum is σ = 138848642. Its totient is φ = 138848640.

The previous prime is 138848621. The next prime is 138848651. The reversal of 138848641 is 146848831.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 88736400 + 50112241 = 9420^2 + 7079^2 .

It is a cyclic number.

It is not a de Polignac number, because 138848641 - 2⁵ = 138848609 is a prime.

It is equal to p_7850689 and since 138848641 and 7850689 have the same sum of digits, it is a Honaker prime.

It is not a weakly prime, because it can be changed into another prime (138848621) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 69424320 + 69424321.

It is an arithmetic number, because the mean of its divisors is an integer number (69424321).

Almost surely, 2^138848641 is an apocalyptic number.

It is an amenable number.

138848641 is a deficient number, since it is larger than the sum of its proper divisors (1).

138848641 is an equidigital number, since it uses as much as digits as its factorization.

138848641 is an evil number, because the sum of its binary digits is even.

The product of its digits is 147456, while the sum is 43.

The square root of 138848641 is about 11783.4053227410. The cubic root of 138848641 is about 517.8220556734.

The spelling of 138848641 in words is "one hundred thirty-eight million, eight hundred forty-eight thousand, six hundred forty-one".