145091889 has 24 divisors (see below), whose sum is σ = 231558912. Its totient is φ = 87077760.

The previous prime is 145091861. The next prime is 145091909. The reversal of 145091889 is 988190541.

145091889 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 145091889 - 2⁵ = 145091857 is a prime.

It is not an unprimeable number, because it can be changed into a prime (145091819) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 17097 + ... + 24134.

It is an arithmetic number, because the mean of its divisors is an integer number (9648288).

Almost surely, 2^145091889 is an apocalyptic number.

It is an amenable number.

145091889 is a deficient number, since it is larger than the sum of its proper divisors (86467023).

145091889 is a wasteful number, since it uses less digits than its factorization.

145091889 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 41277 (or 41274 counting only the distinct ones).

The product of its (nonzero) digits is 103680, while the sum is 45.

The square root of 145091889 is about 12045.4094575485. The cubic root of 145091889 is about 525.4697401221.

It can be divided in two parts, 1450 and 91889, that added together give a palindrome (93339).

The spelling of 145091889 in words is "one hundred forty-five million, ninety-one thousand, eight hundred eighty-nine".