172644473 has 2 divisors, whose sum is σ = 172644474. Its totient is φ = 172644472.

The previous prime is 172644449. The next prime is 172644499. The reversal of 172644473 is 374446271.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 113784889 + 58859584 = 10667^2 + 7672^2 .

It is an emirp because it is prime and its reverse (374446271) is a distict prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-172644473 is a prime.

It is a super-2 number, since 2×172644473² = 59612228114895458, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (172644413) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 86322236 + 86322237.

It is an arithmetic number, because the mean of its divisors is an integer number (86322237).

Almost surely, 2^172644473 is an apocalyptic number.

It is an amenable number.

172644473 is a deficient number, since it is larger than the sum of its proper divisors (1).

172644473 is an equidigital number, since it uses as much as digits as its factorization.

172644473 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 112896, while the sum is 38.

The square root of 172644473 is about 13139.4243785639. The cubic root of 172644473 is about 556.8235051557.

The spelling of 172644473 in words is "one hundred seventy-two million, six hundred forty-four thousand, four hundred seventy-three".