172381856249 has 2 divisors, whose sum is σ = 172381856250. Its totient is φ = 172381856248.

The previous prime is 172381856239. The next prime is 172381856303. The reversal of 172381856249 is 942658183271.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 96778854649 + 75603001600 = 311093^2 + 274960^2 .

It is a cyclic number.

It is not a de Polignac number, because 172381856249 - 2⁴ = 172381856233 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 172381856194 and 172381856203.

It is not a weakly prime, because it can be changed into another prime (172381856239) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 86190928124 + 86190928125.

It is an arithmetic number, because the mean of its divisors is an integer number (86190928125).

Almost surely, 2^172381856249 is an apocalyptic number.

It is an amenable number.

172381856249 is a deficient number, since it is larger than the sum of its proper divisors (1).

172381856249 is an equidigital number, since it uses as much as digits as its factorization.

172381856249 is an evil number, because the sum of its binary digits is even.

The product of its digits is 5806080, while the sum is 56.

The spelling of 172381856249 in words is "one hundred seventy-two billion, three hundred eighty-one million, eight hundred fifty-six thousand, two hundred forty-nine".