172136507 has 4 divisors (see below), whose sum is σ = 173028600. Its totient is φ = 171244416.

The previous prime is 172136479. The next prime is 172136533. The reversal of 172136507 is 705631271.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 705631271 = 10039 ⋅70289.

It is a cyclic number.

It is not a de Polignac number, because 172136507 - 2⁶ = 172136443 is a prime.

It is a super-2 number, since 2×172136507² = 59261954084322098, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (172136207) 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, 445757 + ... + 446142.

It is an arithmetic number, because the mean of its divisors is an integer number (43257150).

Almost surely, 2^172136507 is an apocalyptic number.

172136507 is a deficient number, since it is larger than the sum of its proper divisors (892093).

172136507 is an equidigital number, since it uses as much as digits as its factorization.

172136507 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 892092.

The product of its (nonzero) digits is 8820, while the sum is 32.

The square root of 172136507 is about 13120.0802970104. The cubic root of 172136507 is about 556.2768610182.

Adding to 172136507 its reverse (705631271), we get a palindrome (877767778).

The spelling of 172136507 in words is "one hundred seventy-two million, one hundred thirty-six thousand, five hundred seven".