145621225 has 24 divisors (see below), whose sum is σ = 190925280. Its totient is φ = 109872000.

The previous prime is 145621183. The next prime is 145621237. The reversal of 145621225 is 522126541.

It is not a de Polignac number, because 145621225 - 2⁷ = 145621097 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 145621193 and 145621202.

It is an unprimeable number.

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 23 ways as a sum of consecutive naturals, for example, 132930 + ... + 134020.

It is an arithmetic number, because the mean of its divisors is an integer number (7955220).

Almost surely, 2^145621225 is an apocalyptic number.

It is an amenable number.

145621225 is a deficient number, since it is larger than the sum of its proper divisors (45304055).

145621225 is a wasteful number, since it uses less digits than its factorization.

145621225 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1401 (or 1396 counting only the distinct ones).

The product of its digits is 4800, while the sum is 28.

The square root of 145621225 is about 12067.3619735218. The cubic root of 145621225 is about 526.1079850295.

Adding to 145621225 its reverse (522126541), we get a palindrome (667747766).

The spelling of 145621225 in words is "one hundred forty-five million, six hundred twenty-one thousand, two hundred twenty-five".