145117471 has 4 divisors (see below), whose sum is σ = 145183752. Its totient is φ = 145051192.

The previous prime is 145117463. The next prime is 145117481. The reversal of 145117471 is 174711541.

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 145117471 - 2³ = 145117463 is a prime.

It is a super-3 number, since 3×145117471³ (a number of 25 digits) contains 333 as substring.

It is a Smith number, since the sum of its digits (31) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (145117451) 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, 29740 + ... + 34273.

It is an arithmetic number, because the mean of its divisors is an integer number (36295938).

Almost surely, 2^145117471 is an apocalyptic number.

145117471 is a deficient number, since it is larger than the sum of its proper divisors (66281).

145117471 is an equidigital number, since it uses as much as digits as its factorization.

145117471 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 66280.

The product of its digits is 3920, while the sum is 31.

The square root of 145117471 is about 12046.4713090598. The cubic root of 145117471 is about 525.5006211889.

The spelling of 145117471 in words is "one hundred forty-five million, one hundred seventeen thousand, four hundred seventy-one".