172971057 has 8 divisors (see below), whose sum is σ = 263574976. Its totient is φ = 98840592.

The previous prime is 172971037. The next prime is 172971061. The reversal of 172971057 is 750179271.

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

It is not a de Polignac number, because 172971057 - 2¹⁰ = 172970033 is a prime.

It is not an unprimeable number, because it can be changed into a prime (172971037) 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 in 7 ways as a sum of consecutive naturals, for example, 4118338 + ... + 4118379.

It is an arithmetic number, because the mean of its divisors is an integer number (32946872).

Almost surely, 2^172971057 is an apocalyptic number.

It is an amenable number.

172971057 is a deficient number, since it is larger than the sum of its proper divisors (90603919).

172971057 is an equidigital number, since it uses as much as digits as its factorization.

172971057 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8236727.

The product of its (nonzero) digits is 30870, while the sum is 39.

The square root of 172971057 is about 13151.8461441731. The cubic root of 172971057 is about 557.1743902224.

The spelling of 172971057 in words is "one hundred seventy-two million, nine hundred seventy-one thousand, fifty-seven".