172154309 has 4 divisors (see below), whose sum is σ = 172199916. Its totient is φ = 172108704.

The previous prime is 172154293. The next prime is 172154429. The reversal of 172154309 is 903451271.

172154309 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 903451271 = 151 ⋅5983121.

It can be written as a sum of positive squares in 2 ways, for example, as 6646084 + 165508225 = 2578^2 + 12865^2 .

It is a cyclic number.

It is not a de Polignac number, because 172154309 - 2⁴ = 172154293 is a prime.

It is a super-2 number, since 2×172154309² = 59274212214534962, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (172154009) 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, 16574 + ... + 24879.

It is an arithmetic number, because the mean of its divisors is an integer number (43049979).

Almost surely, 2^172154309 is an apocalyptic number.

It is an amenable number.

172154309 is a deficient number, since it is larger than the sum of its proper divisors (45607).

172154309 is an equidigital number, since it uses as much as digits as its factorization.

172154309 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 45606.

The product of its (nonzero) digits is 7560, while the sum is 32.

The square root of 172154309 is about 13120.7587051969. The cubic root of 172154309 is about 556.2960366897.

The spelling of 172154309 in words is "one hundred seventy-two million, one hundred fifty-four thousand, three hundred nine".