139234969 has 2 divisors, whose sum is σ = 139234970. Its totient is φ = 139234968.

The previous prime is 139234889. The next prime is 139234973. The reversal of 139234969 is 969432931.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 137241225 + 1993744 = 11715^2 + 1412^2 .

It is an emirp because it is prime and its reverse (969432931) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 139234969 - 2⁷ = 139234841 is a prime.

It is a super-2 number, since 2×139234969² = 38772753184861922, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (139234769) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 69617484 + 69617485.

It is an arithmetic number, because the mean of its divisors is an integer number (69617485).

Almost surely, 2^139234969 is an apocalyptic number.

It is an amenable number.

139234969 is a deficient number, since it is larger than the sum of its proper divisors (1).

139234969 is an equidigital number, since it uses as much as digits as its factorization.

139234969 is an evil number, because the sum of its binary digits is even.

The product of its digits is 314928, while the sum is 46.

The square root of 139234969 is about 11799.7868201082. The cubic root of 139234969 is about 518.3018680964.

The spelling of 139234969 in words is "one hundred thirty-nine million, two hundred thirty-four thousand, nine hundred sixty-nine".