139910009 has 2 divisors, whose sum is σ = 139910010. Its totient is φ = 139910008.

The previous prime is 139909997. The next prime is 139910011. The reversal of 139910009 is 900019931.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 128754409 + 11155600 = 11347^2 + 3340^2 .

It is a cyclic number.

It is not a de Polignac number, because 139910009 - 2⁴ = 139909993 is a prime.

Together with 139910011, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (139910609) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 69955004 + 69955005.

It is an arithmetic number, because the mean of its divisors is an integer number (69955005).

Almost surely, 2^139910009 is an apocalyptic number.

It is an amenable number.

139910009 is a deficient number, since it is larger than the sum of its proper divisors (1).

139910009 is an equidigital number, since it uses as much as digits as its factorization.

139910009 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 2187, while the sum is 32.

The square root of 139910009 is about 11828.3561410705. The cubic root of 139910009 is about 519.1381297343.

The spelling of 139910009 in words is "one hundred thirty-nine million, nine hundred ten thousand, nine".