145681489 has 2 divisors, whose sum is σ = 145681490. Its totient is φ = 145681488.

The previous prime is 145681453. The next prime is 145681511. The reversal of 145681489 is 984186541.

145681489 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 122323600 + 23357889 = 11060^2 + 4833^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-145681489 is a prime.

It is not a weakly prime, because it can be changed into another prime (145681429) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 72840744 + 72840745.

It is an arithmetic number, because the mean of its divisors is an integer number (72840745).

Almost surely, 2^145681489 is an apocalyptic number.

It is an amenable number.

145681489 is a deficient number, since it is larger than the sum of its proper divisors (1).

145681489 is an equidigital number, since it uses as much as digits as its factorization.

145681489 is an evil number, because the sum of its binary digits is even.

The product of its digits is 276480, while the sum is 46.

The square root of 145681489 is about 12069.8586984273. The cubic root of 145681489 is about 526.1805499983.

The spelling of 145681489 in words is "one hundred forty-five million, six hundred eighty-one thousand, four hundred eighty-nine".