172100479 has 4 divisors (see below), whose sum is σ = 172511640. Its totient is φ = 171689320.

The previous prime is 172100449. The next prime is 172100497. The reversal of 172100479 is 974001271.

172100479 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 172100479 - 2⁷ = 172100351 is a prime.

It is a Smith number, since the sum of its digits (31) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 172100479.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (172100419) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 204952 + ... + 205789.

It is an arithmetic number, because the mean of its divisors is an integer number (43127910).

Almost surely, 2^172100479 is an apocalyptic number.

172100479 is a deficient number, since it is larger than the sum of its proper divisors (411161).

172100479 is an equidigital number, since it uses as much as digits as its factorization.

172100479 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 411160.

The product of its (nonzero) digits is 3528, while the sum is 31.

The square root of 172100479 is about 13118.7072152709. The cubic root of 172100479 is about 556.2380489121.

The spelling of 172100479 in words is "one hundred seventy-two million, one hundred thousand, four hundred seventy-nine".