172688849 has 2 divisors, whose sum is σ = 172688850. Its totient is φ = 172688848.

The previous prime is 172688819. The next prime is 172688897. The reversal of 172688849 is 948886271.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 167236624 + 5452225 = 12932^2 + 2335^2 .

It is a cyclic number.

It is not a de Polignac number, because 172688849 - 2¹⁶ = 172623313 is a prime.

It is a Chen prime.

It is a self number, because there is not a number n which added to its sum of digits gives 172688849.

It is not a weakly prime, because it can be changed into another prime (172688819) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 86344424 + 86344425.

It is an arithmetic number, because the mean of its divisors is an integer number (86344425).

Almost surely, 2^172688849 is an apocalyptic number.

It is an amenable number.

172688849 is a deficient number, since it is larger than the sum of its proper divisors (1).

172688849 is an equidigital number, since it uses as much as digits as its factorization.

172688849 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1548288, while the sum is 53.

The square root of 172688849 is about 13141.1129285156. The cubic root of 172688849 is about 556.8712091311.

The spelling of 172688849 in words is "one hundred seventy-two million, six hundred eighty-eight thousand, eight hundred forty-nine".