145521889 has 4 divisors (see below), whose sum is σ = 145559700. Its totient is φ = 145484080.

The previous prime is 145521869. The next prime is 145521947. The reversal of 145521889 is 988125541.

145521889 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.

It can be written as a sum of positive squares in 2 ways, for example, as 29593600 + 115928289 = 5440^2 + 10767^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-145521889 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (145521869) 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, 12382 + ... + 21079.

It is an arithmetic number, because the mean of its divisors is an integer number (36389925).

Almost surely, 2^145521889 is an apocalyptic number.

It is an amenable number.

145521889 is a deficient number, since it is larger than the sum of its proper divisors (37811).

145521889 is an equidigital number, since it uses as much as digits as its factorization.

145521889 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 37810.

The product of its digits is 115200, while the sum is 43.

The square root of 145521889 is about 12063.2453759343. The cubic root of 145521889 is about 525.9883290504.

The spelling of 145521889 in words is "one hundred forty-five million, five hundred twenty-one thousand, eight hundred eighty-nine".