1712221639 has 2 divisors, whose sum is σ = 1712221640. Its totient is φ = 1712221638.

The previous prime is 1712221607. The next prime is 1712221661. The reversal of 1712221639 is 9361222171.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 1712221639 - 2⁵ = 1712221607 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1713221639) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 856110819 + 856110820.

It is an arithmetic number, because the mean of its divisors is an integer number (856110820).

Almost surely, 2^1712221639 is an apocalyptic number.

1712221639 is a deficient number, since it is larger than the sum of its proper divisors (1).

1712221639 is an equidigital number, since it uses as much as digits as its factorization.

1712221639 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 9072, while the sum is 34.

The square root of 1712221639 is about 41378.9999758332. Note that the first 4 decimals coincide. The cubic root of 1712221639 is about 1196.3364282041.

The spelling of 1712221639 in words is "one billion, seven hundred twelve million, two hundred twenty-one thousand, six hundred thirty-nine".