145505091 has 16 divisors (see below), whose sum is σ = 209793024. Its totient is φ = 89353344.

The previous prime is 145505083. The next prime is 145505119. The reversal of 145505091 is 190505541.

It is not a de Polignac number, because 145505091 - 2³ = 145505083 is a prime.

It is not an unprimeable number, because it can be changed into a prime (145505071) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 27955 + ... + 32748.

It is an arithmetic number, because the mean of its divisors is an integer number (13112064).

Almost surely, 2^145505091 is an apocalyptic number.

145505091 is a deficient number, since it is larger than the sum of its proper divisors (64287933).

145505091 is a wasteful number, since it uses less digits than its factorization.

145505091 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 60770.

The product of its (nonzero) digits is 4500, while the sum is 30.

The square root of 145505091 is about 12062.5491087083. The cubic root of 145505091 is about 525.9680895020.

The spelling of 145505091 in words is "one hundred forty-five million, five hundred five thousand, ninety-one".