172561445 has 16 divisors (see below), whose sum is σ = 238032000. Its totient is φ = 117639744.

The previous prime is 172561427. The next prime is 172561483. The reversal of 172561445 is 544165271.

It is a cyclic number.

It is not a de Polignac number, because 172561445 - 2²⁴ = 155784229 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (35).

It is a Curzon number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 8195 + ... + 20304.

It is an arithmetic number, because the mean of its divisors is an integer number (14877000).

Almost surely, 2^172561445 is an apocalyptic number.

It is an amenable number.

172561445 is a deficient number, since it is larger than the sum of its proper divisors (65470555).

172561445 is a wasteful number, since it uses less digits than its factorization.

172561445 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 28684.

The product of its digits is 33600, while the sum is 35.

The square root of 172561445 is about 13136.2644994686. The cubic root of 172561445 is about 556.7342285160.

The spelling of 172561445 in words is "one hundred seventy-two million, five hundred sixty-one thousand, four hundred forty-five".