139230869 has 2 divisors, whose sum is σ = 139230870. Its totient is φ = 139230868.

The previous prime is 139230797. The next prime is 139230877. The reversal of 139230869 is 968032931.

139230869 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., 133287025 + 5943844 = 11545^2 + 2438^2 .

It is an emirp because it is prime and its reverse (968032931) is a distict prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-139230869 is a prime.

It is a super-2 number, since 2×139230869² = 38770469764990322, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (139230899) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 69615434 + 69615435.

It is an arithmetic number, because the mean of its divisors is an integer number (69615435).

Almost surely, 2^139230869 is an apocalyptic number.

It is an amenable number.

139230869 is a deficient number, since it is larger than the sum of its proper divisors (1).

139230869 is an equidigital number, since it uses as much as digits as its factorization.

139230869 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 69984, while the sum is 41.

The square root of 139230869 is about 11799.6130868770. The cubic root of 139230869 is about 518.2967806327.

The spelling of 139230869 in words is "one hundred thirty-nine million, two hundred thirty thousand, eight hundred sixty-nine".