145825221 has 16 divisors (see below), whose sum is σ = 203607936. Its totient is φ = 92659776.

The previous prime is 145825213. The next prime is 145825249. The reversal of 145825221 is 122528541.

It is not a de Polignac number, because 145825221 - 2³ = 145825213 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (145825291) 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, 16611 + ... + 23823.

It is an arithmetic number, because the mean of its divisors is an integer number (12725496).

Almost surely, 2^145825221 is an apocalyptic number.

It is an amenable number.

145825221 is a deficient number, since it is larger than the sum of its proper divisors (57782715).

145825221 is a wasteful number, since it uses less digits than its factorization.

145825221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7532.

The product of its digits is 6400, while the sum is 30.

The square root of 145825221 is about 12075.8114013096. The cubic root of 145825221 is about 526.3535395448.

The spelling of 145825221 in words is "one hundred forty-five million, eight hundred twenty-five thousand, two hundred twenty-one".