172315949 has 18 divisors (see below), whose sum is σ = 192985578. Its totient is φ = 153784800.

The previous prime is 172315909. The next prime is 172315973. The reversal of 172315949 is 949513271.

It can be written as a sum of positive squares in 3 ways, for example, as 1177225 + 171138724 = 1085^2 + 13082^2 .

It is a de Polignac number, because none of the positive numbers 2^k-172315949 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 (172315909) 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 17 ways as a sum of consecutive naturals, for example, 161879 + ... + 162939.

It is an arithmetic number, because the mean of its divisors is an integer number (10721421).

Almost surely, 2^172315949 is an apocalyptic number.

It is an amenable number.

172315949 is a deficient number, since it is larger than the sum of its proper divisors (20669629).

172315949 is a wasteful number, since it uses less digits than its factorization.

172315949 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1149 (or 1105 counting only the distinct ones).

The product of its digits is 68040, while the sum is 41.

The square root of 172315949 is about 13126.9169647713. The cubic root of 172315949 is about 556.4700889957.

The spelling of 172315949 in words is "one hundred seventy-two million, three hundred fifteen thousand, nine hundred forty-nine".