172561138 has 8 divisors (see below), whose sum is σ = 259826688. Its totient is φ = 85952244.

The previous prime is 172561117. The next prime is 172561141. The reversal of 172561138 is 831165271.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 163506 + ... + 164557.

It is an arithmetic number, because the mean of its divisors is an integer number (32478336).

Almost surely, 2^172561138 is an apocalyptic number.

172561138 is a deficient number, since it is larger than the sum of its proper divisors (87265550).

172561138 is a wasteful number, since it uses less digits than its factorization.

172561138 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 328328.

The product of its digits is 10080, while the sum is 34.

The square root of 172561138 is about 13136.2528142541. The cubic root of 172561138 is about 556.7338983582.

The spelling of 172561138 in words is "one hundred seventy-two million, five hundred sixty-one thousand, one hundred thirty-eight".