145890289 has 4 divisors (see below), whose sum is σ = 148067824. Its totient is φ = 143712756.

The previous prime is 145890263. The next prime is 145890293. The reversal of 145890289 is 982098541.

145890289 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 982098541 = 4999 ⋅196459.

It is a cyclic number.

It is not a de Polignac number, because 145890289 - 2¹⁵ = 145857521 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (145890299) 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, 1088667 + ... + 1088800.

It is an arithmetic number, because the mean of its divisors is an integer number (37016956).

Almost surely, 2^145890289 is an apocalyptic number.

It is an amenable number.

145890289 is a deficient number, since it is larger than the sum of its proper divisors (2177535).

145890289 is an equidigital number, since it uses as much as digits as its factorization.

145890289 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2177534.

The product of its (nonzero) digits is 207360, while the sum is 46.

The square root of 145890289 is about 12078.5052469252. The cubic root of 145890289 is about 526.4318151662.

The spelling of 145890289 in words is "one hundred forty-five million, eight hundred ninety thousand, two hundred eighty-nine".