146220561 has 24 divisors (see below), whose sum is σ = 224107520. Its totient is φ = 91609056.

The previous prime is 146220539. The next prime is 146220563. The reversal of 146220561 is 165022641.

It is not a de Polignac number, because 146220561 - 2⁹ = 146220049 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (146220563) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 18351 + ... + 25083.

Almost surely, 2^146220561 is an apocalyptic number.

It is an amenable number.

146220561 is a deficient number, since it is larger than the sum of its proper divisors (77886959).

146220561 is a wasteful number, since it uses less digits than its factorization.

146220561 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6885 (or 6882 counting only the distinct ones).

The product of its (nonzero) digits is 2880, while the sum is 27.

The square root of 146220561 is about 12092.1694083403. The cubic root of 146220561 is about 526.8287679110.

The spelling of 146220561 in words is "one hundred forty-six million, two hundred twenty thousand, five hundred sixty-one".