172561461 has 4 divisors (see below), whose sum is σ = 230081952. Its totient is φ = 115040972.

The previous prime is 172561427. The next prime is 172561483. The reversal of 172561461 is 164165271.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 172561461 - 2¹⁴ = 172545077 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (172561421) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 28760241 + ... + 28760246.

It is an arithmetic number, because the mean of its divisors is an integer number (57520488).

Almost surely, 2^172561461 is an apocalyptic number.

It is an amenable number.

172561461 is a deficient number, since it is larger than the sum of its proper divisors (57520491).

172561461 is an equidigital number, since it uses as much as digits as its factorization.

172561461 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 57520490.

The product of its digits is 10080, while the sum is 33.

The square root of 172561461 is about 13136.2651084698. The cubic root of 172561461 is about 556.7342457229.

The spelling of 172561461 in words is "one hundred seventy-two million, five hundred sixty-one thousand, four hundred sixty-one".