172251343909 has 2 divisors, whose sum is σ = 172251343910. Its totient is φ = 172251343908.

The previous prime is 172251343883. The next prime is 172251343967. The reversal of 172251343909 is 909343152271.

It is a happy number.

172251343909 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 140533514884 + 31717829025 = 374878^2 + 178095^2 .

It is a cyclic number.

It is not a de Polignac number, because 172251343909 - 2²³ = 172242955301 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (172251343309) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 86125671954 + 86125671955.

It is an arithmetic number, because the mean of its divisors is an integer number (86125671955).

Almost surely, 2^172251343909 is an apocalyptic number.

It is an amenable number.

172251343909 is a deficient number, since it is larger than the sum of its proper divisors (1).

172251343909 is an equidigital number, since it uses as much as digits as its factorization.

172251343909 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 408240, while the sum is 46.

The spelling of 172251343909 in words is "one hundred seventy-two billion, two hundred fifty-one million, three hundred forty-three thousand, nine hundred nine".