145531 has 2 divisors, whose sum is σ = 145532. Its totient is φ = 145530.

The previous prime is 145517. The next prime is 145543. The reversal of 145531 is 135541.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 145531 - 2¹¹ = 143483 is a prime.

It is a super-2 number, since 2×145531² = 42358543922, which contains 22 as substring.

It is a pancake number, because a pancake can be divided into 145531 parts by 539 straight cuts.

It is a junction number, because it is equal to n+sod(n) for n = 145499 and 145508.

It is not a weakly prime, because it can be changed into another prime (145501) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 72765 + 72766.

It is an arithmetic number, because the mean of its divisors is an integer number (72766).

2¹⁴⁵⁵³¹ is an apocalyptic number.

145531 is a deficient number, since it is larger than the sum of its proper divisors (1).

145531 is an equidigital number, since it uses as much as digits as its factorization.

145531 is an evil number, because the sum of its binary digits is even.

The product of its digits is 300, while the sum is 19.

The square root of 145531 is about 381.4852552852. The cubic root of 145531 is about 52.5999306047.

It can be divided in two parts, 145 and 531, that added together give a palindrome (676).

The spelling of 145531 in words is "one hundred forty-five thousand, five hundred thirty-one".