145531489 has 2 divisors, whose sum is σ = 145531490. Its totient is φ = 145531488.

The previous prime is 145531433. The next prime is 145531501. The reversal of 145531489 is 984135541.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 88679889 + 56851600 = 9417^2 + 7540^2 .

It is a cyclic number.

It is not a de Polignac number, because 145531489 - 2¹³ = 145523297 is a prime.

It is not a weakly prime, because it can be changed into another prime (145531409) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 72765744 + 72765745.

It is an arithmetic number, because the mean of its divisors is an integer number (72765745).

Almost surely, 2^145531489 is an apocalyptic number.

It is an amenable number.

145531489 is a deficient number, since it is larger than the sum of its proper divisors (1).

145531489 is an equidigital number, since it uses as much as digits as its factorization.

145531489 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 86400, while the sum is 40.

The square root of 145531489 is about 12063.6432722457. The cubic root of 145531489 is about 525.9998951842. Note that the first 3 decimals are identical.

The spelling of 145531489 in words is "one hundred forty-five million, five hundred thirty-one thousand, four hundred eighty-nine".