145005581 has 8 divisors (see below), whose sum is σ = 166082304. Its totient is φ = 124019280.

The previous prime is 145005577. The next prime is 145005583. The reversal of 145005581 is 185500541.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 145005581 - 2² = 145005577 is a prime.

It is a super-2 number, since 2×145005581² = 42053237042295122, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (145005583) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 19130 + ... + 25611.

It is an arithmetic number, because the mean of its divisors is an integer number (20760288).

Almost surely, 2^145005581 is an apocalyptic number.

It is an amenable number.

145005581 is a deficient number, since it is larger than the sum of its proper divisors (21076723).

145005581 is an equidigital number, since it uses as much as digits as its factorization.

145005581 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 45211.

The product of its (nonzero) digits is 4000, while the sum is 29.

The square root of 145005581 is about 12041.8263149740. The cubic root of 145005581 is about 525.3655274557.

The spelling of 145005581 in words is "one hundred forty-five million, five thousand, five hundred eighty-one".