172081969 has 8 divisors (see below), whose sum is σ = 178191720. Its totient is φ = 165984000.

The previous prime is 172081957. The next prime is 172081981. The reversal of 172081969 is 969180271.

It is an interprime number because it is at equal distance from previous prime (172081957) and next prime (172081981).

It can be written as a sum of positive squares in 4 ways, for example, as 471969 + 171610000 = 687^2 + 13100^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 172081969 - 2¹⁵ = 172049201 is a prime.

It is a super-2 number, since 2×172081969² = 59224408109833922, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (172081909) 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 in 7 ways as a sum of consecutive naturals, for example, 35449 + ... + 40009.

It is an arithmetic number, because the mean of its divisors is an integer number (22273965).

Almost surely, 2^172081969 is an apocalyptic number.

It is an amenable number.

172081969 is a deficient number, since it is larger than the sum of its proper divisors (6109751).

172081969 is a wasteful number, since it uses less digits than its factorization.

172081969 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5891.

The product of its (nonzero) digits is 54432, while the sum is 43.

The square root of 172081969 is about 13118.0017152004. The cubic root of 172081969 is about 556.2181064237.

The spelling of 172081969 in words is "one hundred seventy-two million, eighty-one thousand, nine hundred sixty-nine".