139222609 has 2 divisors, whose sum is σ = 139222610. Its totient is φ = 139222608.

The previous prime is 139222553. The next prime is 139222621. The reversal of 139222609 is 906222931.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 118200384 + 21022225 = 10872^2 + 4585^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-139222609 is a prime.

It is not a weakly prime, because it can be changed into another prime (139222669) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 69611304 + 69611305.

It is an arithmetic number, because the mean of its divisors is an integer number (69611305).

Almost surely, 2^139222609 is an apocalyptic number.

It is an amenable number.

139222609 is a deficient number, since it is larger than the sum of its proper divisors (1).

139222609 is an equidigital number, since it uses as much as digits as its factorization.

139222609 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 11664, while the sum is 34.

The square root of 139222609 is about 11799.2630702091. The cubic root of 139222609 is about 518.2865309515.

The spelling of 139222609 in words is "one hundred thirty-nine million, two hundred twenty-two thousand, six hundred nine".