171945454 has 4 divisors (see below), whose sum is σ = 257918184. Its totient is φ = 85972726.

The previous prime is 171945451. The next prime is 171945467. The reversal of 171945454 is 454549171.

It is a happy number.

It is a semiprime because it is the product of two primes.

It is a super-2 number, since 2×171945454² = 59130478302532232, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (171945451) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 42986362 + ... + 42986365.

It is an arithmetic number, because the mean of its divisors is an integer number (64479546).

Almost surely, 2^171945454 is an apocalyptic number.

171945454 is a deficient number, since it is larger than the sum of its proper divisors (85972730).

171945454 is an equidigital number, since it uses as much as digits as its factorization.

171945454 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 85972729.

The product of its digits is 100800, while the sum is 40.

The square root of 171945454 is about 13112.7973369529. The cubic root of 171945454 is about 556.0709823459.

The spelling of 171945454 in words is "one hundred seventy-one million, nine hundred forty-five thousand, four hundred fifty-four".