172137969 has 6 divisors (see below), whose sum is σ = 248643746. Its totient is φ = 114758640.

The previous prime is 172137961. The next prime is 172137989. The reversal of 172137969 is 969731271.

172137969 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in only one way, i.e., 136890000 + 35247969 = 11700^2 + 5937^2 .

It is not a de Polignac number, because 172137969 - 2³ = 172137961 is a prime.

It is a super-2 number, since 2×172137969² = 59262960742889922, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (172137961) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 9563212 + ... + 9563229.

Almost surely, 2^172137969 is an apocalyptic number.

It is an amenable number.

172137969 is a deficient number, since it is larger than the sum of its proper divisors (76505777).

172137969 is a wasteful number, since it uses less digits than its factorization.

172137969 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 19126447 (or 19126444 counting only the distinct ones).

The product of its digits is 142884, while the sum is 45.

The square root of 172137969 is about 13120.1360130145. The cubic root of 172137969 is about 556.2784358817.

The spelling of 172137969 in words is "one hundred seventy-two million, one hundred thirty-seven thousand, nine hundred sixty-nine".