172434661 has 4 divisors (see below), whose sum is σ = 197068192. Its totient is φ = 147801132.

The previous prime is 172434659. The next prime is 172434701. The reversal of 172434661 is 166434271.

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 172434661 - 2¹ = 172434659 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (172434761) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 12316755 + ... + 12316768.

It is an arithmetic number, because the mean of its divisors is an integer number (49267048).

Almost surely, 2^172434661 is an apocalyptic number.

It is an amenable number.

172434661 is a deficient number, since it is larger than the sum of its proper divisors (24633531).

172434661 is an equidigital number, since it uses as much as digits as its factorization.

172434661 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 24633530.

The product of its digits is 24192, while the sum is 34.

The square root of 172434661 is about 13131.4378877562. The cubic root of 172434661 is about 556.5978475568.

It can be divided in two parts, 17243 and 4661, that added together give a square (21904 = 148²).

The spelling of 172434661 in words is "one hundred seventy-two million, four hundred thirty-four thousand, six hundred sixty-one".