172016869 has 2 divisors, whose sum is σ = 172016870. Its totient is φ = 172016868.

The previous prime is 172016749. The next prime is 172016903. The reversal of 172016869 is 968610271.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 135256900 + 36759969 = 11630^2 + 6063^2 .

It is an emirp because it is prime and its reverse (968610271) is a distict prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-172016869 is a prime.

It is a super-2 number, since 2×172016869² = 59179606441126322, which contains 22 as substring.

It is equal to p_9609592 and since 172016869 and 9609592 have the same sum of digits, it is a Honaker prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (172016969) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 86008434 + 86008435.

It is an arithmetic number, because the mean of its divisors is an integer number (86008435).

Almost surely, 2^172016869 is an apocalyptic number.

It is an amenable number.

172016869 is a deficient number, since it is larger than the sum of its proper divisors (1).

172016869 is an equidigital number, since it uses as much as digits as its factorization.

172016869 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 36288, while the sum is 40.

The square root of 172016869 is about 13115.5201574318. The cubic root of 172016869 is about 556.1479569748.

The spelling of 172016869 in words is "one hundred seventy-two million, sixteen thousand, eight hundred sixty-nine".