139366069 has 2 divisors, whose sum is σ = 139366070. Its totient is φ = 139366068.

The previous prime is 139366043. The next prime is 139366081. The reversal of 139366069 is 960663931.

139366069 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., 113742225 + 25623844 = 10665^2 + 5062^2 .

It is a cyclic number.

It is not a de Polignac number, because 139366069 - 2⁵ = 139366037 is a prime.

It is a super-2 number, since 2×139366069² = 38845802377025522, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (139366099) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 69683034 + 69683035.

It is an arithmetic number, because the mean of its divisors is an integer number (69683035).

Almost surely, 2^139366069 is an apocalyptic number.

It is an amenable number.

139366069 is a deficient number, since it is larger than the sum of its proper divisors (1).

139366069 is an equidigital number, since it uses as much as digits as its factorization.

139366069 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 157464, while the sum is 43.

The square root of 139366069 is about 11805.3406981756. The cubic root of 139366069 is about 518.4644902214.

The spelling of 139366069 in words is "one hundred thirty-nine million, three hundred sixty-six thousand, sixty-nine".