612172789 has 2 divisors, whose sum is σ = 612172790. Its totient is φ = 612172788.

The previous prime is 612172777. The next prime is 612172871. The reversal of 612172789 is 987271216.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 423659889 + 188512900 = 20583^2 + 13730^2 .

It is a cyclic number.

It is not a de Polignac number, because 612172789 - 2⁹ = 612172277 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (612172709) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 306086394 + 306086395.

It is an arithmetic number, because the mean of its divisors is an integer number (306086395).

Almost surely, 2^612172789 is an apocalyptic number.

It is an amenable number.

612172789 is a deficient number, since it is larger than the sum of its proper divisors (1).

612172789 is an equidigital number, since it uses as much as digits as its factorization.

612172789 is an evil number, because the sum of its binary digits is even.

The product of its digits is 84672, while the sum is 43.

The square root of 612172789 is about 24742.1257979180. The cubic root of 612172789 is about 849.0983698934.

The spelling of 612172789 in words is "six hundred twelve million, one hundred seventy-two thousand, seven hundred eighty-nine".