172015023 has 16 divisors (see below), whose sum is σ = 231874560. Its totient is φ = 113422176.

The previous prime is 172015021. The next prime is 172015057. The reversal of 172015023 is 320510271.

It is not a de Polignac number, because 172015023 - 2¹ = 172015021 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (172015021) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 193486 + ... + 194372.

It is an arithmetic number, because the mean of its divisors is an integer number (14492160).

Almost surely, 2^172015023 is an apocalyptic number.

172015023 is a deficient number, since it is larger than the sum of its proper divisors (59859537).

172015023 is a wasteful number, since it uses less digits than its factorization.

172015023 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1526.

The product of its (nonzero) digits is 420, while the sum is 21.

The square root of 172015023 is about 13115.4497826037. The cubic root of 172015023 is about 556.1459675328.

Adding to 172015023 its reverse (320510271), we get a palindrome (492525294).

The spelling of 172015023 in words is "one hundred seventy-two million, fifteen thousand, twenty-three".