145609171 has 4 divisors (see below), whose sum is σ = 149544592. Its totient is φ = 141673752.

The previous prime is 145609153. The next prime is 145609193. The reversal of 145609171 is 171906541.

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

It is a cyclic number.

It is not a de Polignac number, because 145609171 - 2¹³ = 145600979 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (145609271) 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, 1967655 + ... + 1967728.

It is an arithmetic number, because the mean of its divisors is an integer number (37386148).

Almost surely, 2^145609171 is an apocalyptic number.

145609171 is a deficient number, since it is larger than the sum of its proper divisors (3935421).

145609171 is an equidigital number, since it uses as much as digits as its factorization.

145609171 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3935420.

The product of its (nonzero) digits is 7560, while the sum is 34.

The square root of 145609171 is about 12066.8625168268. The cubic root of 145609171 is about 526.0934681882.

The spelling of 145609171 in words is "one hundred forty-five million, six hundred nine thousand, one hundred seventy-one".