145571 has 4 divisors (see below), whose sum is σ = 154152. Its totient is φ = 136992.

The previous prime is 145549. The next prime is 145577. The reversal of 145571 is 175541.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 175541 = 19 ⋅9239.

It is a cyclic number.

It is not a de Polignac number, because 145571 - 2¹⁴ = 129187 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (145577) 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, 4265 + ... + 4298.

It is an arithmetic number, because the mean of its divisors is an integer number (38538).

2¹⁴⁵⁵⁷¹ is an apocalyptic number.

145571 is a deficient number, since it is larger than the sum of its proper divisors (8581).

145571 is an equidigital number, since it uses as much as digits as its factorization.

145571 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8580.

The product of its digits is 700, while the sum is 23.

The square root of 145571 is about 381.5376783491. The cubic root of 145571 is about 52.6047492905.

The spelling of 145571 in words is "one hundred forty-five thousand, five hundred seventy-one".