139019641 has 2 divisors, whose sum is σ = 139019642. Its totient is φ = 139019640.

The previous prime is 139019627. The next prime is 139019681. The reversal of 139019641 is 146910931.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 115777600 + 23242041 = 10760^2 + 4821^2 .

It is an emirp because it is prime and its reverse (146910931) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 139019641 - 2²⁵ = 105465209 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 139019597 and 139019606.

It is not a weakly prime, because it can be changed into another prime (139019611) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 69509820 + 69509821.

It is an arithmetic number, because the mean of its divisors is an integer number (69509821).

Almost surely, 2^139019641 is an apocalyptic number.

It is an amenable number.

139019641 is a deficient number, since it is larger than the sum of its proper divisors (1).

139019641 is an equidigital number, since it uses as much as digits as its factorization.

139019641 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 5832, while the sum is 34.

The square root of 139019641 is about 11790.6590570672. The cubic root of 139019641 is about 518.0345442395.

The spelling of 139019641 in words is "one hundred thirty-nine million, nineteen thousand, six hundred forty-one".