139222529 has 2 divisors, whose sum is σ = 139222530. Its totient is φ = 139222528.

The previous prime is 139222513. The next prime is 139222543. The reversal of 139222529 is 925222931.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 138109504 + 1113025 = 11752^2 + 1055^2 .

It is a cyclic number.

It is not a de Polignac number, because 139222529 - 2⁴ = 139222513 is a prime.

It is equal to p_7870625 and since 139222529 and 7870625 have the same sum of digits, it is a Honaker prime.

It is not a weakly prime, because it can be changed into another prime (139222549) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 69611264 + 69611265.

It is an arithmetic number, because the mean of its divisors is an integer number (69611265).

Almost surely, 2^139222529 is an apocalyptic number.

It is an amenable number.

139222529 is a deficient number, since it is larger than the sum of its proper divisors (1).

139222529 is an equidigital number, since it uses as much as digits as its factorization.

139222529 is an evil number, because the sum of its binary digits is even.

The product of its digits is 19440, while the sum is 35.

The square root of 139222529 is about 11799.2596801664. The cubic root of 139222529 is about 518.2864316790.

The spelling of 139222529 in words is "one hundred thirty-nine million, two hundred twenty-two thousand, five hundred twenty-nine".