172671947 has 4 divisors (see below), whose sum is σ = 197339376. Its totient is φ = 148004520.

The previous prime is 172671913. The next prime is 172671949. The reversal of 172671947 is 749176271.

172671947 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, and also an emirpimes, since its reverse is a distinct semiprime: 749176271 = 3037 ⋅246683.

It is a cyclic number.

It is not a de Polignac number, because 172671947 - 2¹⁸ = 172409803 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 172671898 and 172671907.

It is not an unprimeable number, because it can be changed into a prime (172671949) 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, 12333704 + ... + 12333717.

It is an arithmetic number, because the mean of its divisors is an integer number (49334844).

Almost surely, 2^172671947 is an apocalyptic number.

172671947 is a deficient number, since it is larger than the sum of its proper divisors (24667429).

172671947 is an equidigital number, since it uses as much as digits as its factorization.

172671947 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 24667428.

The product of its digits is 148176, while the sum is 44.

The square root of 172671947 is about 13140.4698165629. The cubic root of 172671947 is about 556.8530405303.

The spelling of 172671947 in words is "one hundred seventy-two million, six hundred seventy-one thousand, nine hundred forty-seven".