145531123 has 2 divisors, whose sum is σ = 145531124. Its totient is φ = 145531122.

The previous prime is 145531079. The next prime is 145531151. The reversal of 145531123 is 321135541.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 145531123 - 2⁹ = 145530611 is a prime.

It is a super-2 number, since 2×145531123² = 42358615523282258, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (145531153) 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 as a sum of consecutive naturals, namely, 72765561 + 72765562.

It is an arithmetic number, because the mean of its divisors is an integer number (72765562).

Almost surely, 2^145531123 is an apocalyptic number.

145531123 is a deficient number, since it is larger than the sum of its proper divisors (1).

145531123 is an equidigital number, since it uses as much as digits as its factorization.

145531123 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 1800, while the sum is 25.

The square root of 145531123 is about 12063.6281026895. The cubic root of 145531123 is about 525.9994542347. Note that the first 3 decimals are identical.

Adding to 145531123 its reverse (321135541), we get a palindrome (466666664).

The spelling of 145531123 in words is "one hundred forty-five million, five hundred thirty-one thousand, one hundred twenty-three".