172206641 has 4 divisors (see below), whose sum is σ = 172536432. Its totient is φ = 171876852.

The previous prime is 172206631. The next prime is 172206647. The reversal of 172206641 is 146602271.

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 a de Polignac number, because none of the positive numbers 2^k-172206641 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (172206647) 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, 164111 + ... + 165156.

It is an arithmetic number, because the mean of its divisors is an integer number (43134108).

Almost surely, 2^172206641 is an apocalyptic number.

It is an amenable number.

172206641 is a deficient number, since it is larger than the sum of its proper divisors (329791).

172206641 is an equidigital number, since it uses as much as digits as its factorization.

172206641 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 329790.

The product of its (nonzero) digits is 4032, while the sum is 29.

The square root of 172206641 is about 13122.7527980984. The cubic root of 172206641 is about 556.3523991764.

The spelling of 172206641 in words is "one hundred seventy-two million, two hundred six thousand, six hundred forty-one".