172871957 has 4 divisors (see below), whose sum is σ = 175240140. Its totient is φ = 170503776.

The previous prime is 172871927. The next prime is 172871971. The reversal of 172871957 is 759178271.

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

It can be written as a sum of positive squares in 2 ways, for example, as 80442961 + 92428996 = 8969^2 + 9614^2 .

It is a cyclic number.

It is not a de Polignac number, because 172871957 - 2⁶ = 172871893 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (172871917) 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 3 ways as a sum of consecutive naturals, for example, 1183982 + ... + 1184127.

It is an arithmetic number, because the mean of its divisors is an integer number (43810035).

Almost surely, 2^172871957 is an apocalyptic number.

It is an amenable number.

172871957 is a deficient number, since it is larger than the sum of its proper divisors (2368183).

172871957 is an equidigital number, since it uses as much as digits as its factorization.

172871957 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2368182.

The product of its digits is 246960, while the sum is 47.

The square root of 172871957 is about 13148.0780724789. The cubic root of 172871957 is about 557.0679629173.

The spelling of 172871957 in words is "one hundred seventy-two million, eight hundred seventy-one thousand, nine hundred fifty-seven".