172870949 has 4 divisors (see below), whose sum is σ = 181969440. Its totient is φ = 163772460.

The previous prime is 172870939. The next prime is 172870963. The reversal of 172870949 is 949078271.

172870949 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 a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 172870949 - 2⁴ = 172870933 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (172870939) 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, 4549217 + ... + 4549254.

It is an arithmetic number, because the mean of its divisors is an integer number (45492360).

Almost surely, 2^172870949 is an apocalyptic number.

172870949 is a gapful number since it is divisible by the number (19) formed by its first and last digit.

It is an amenable number.

172870949 is a deficient number, since it is larger than the sum of its proper divisors (9098491).

172870949 is an equidigital number, since it uses as much as digits as its factorization.

172870949 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9098490.

The product of its (nonzero) digits is 254016, while the sum is 47.

The square root of 172870949 is about 13148.0397398243. The cubic root of 172870949 is about 557.0668801784.

The spelling of 172870949 in words is "one hundred seventy-two million, eight hundred seventy thousand, nine hundred forty-nine".