145185621 has 16 divisors (see below), whose sum is σ = 221405184. Its totient is φ = 82899504.

The previous prime is 145185619. The next prime is 145185671. The reversal of 145185621 is 126581541.

It is not a de Polignac number, because 145185621 - 2¹ = 145185619 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (145185671) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 46516 + ... + 49538.

It is an arithmetic number, because the mean of its divisors is an integer number (13837824).

Almost surely, 2^145185621 is an apocalyptic number.

It is an amenable number.

145185621 is a deficient number, since it is larger than the sum of its proper divisors (76219563).

145185621 is a wasteful number, since it uses less digits than its factorization.

145185621 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5320.

The product of its digits is 9600, while the sum is 33.

The square root of 145185621 is about 12049.2996062012. The cubic root of 145185621 is about 525.5828701017.

The spelling of 145185621 in words is "one hundred forty-five million, one hundred eighty-five thousand, six hundred twenty-one".