146222561 has 4 divisors (see below), whose sum is σ = 146279172. Its totient is φ = 146165952.

The previous prime is 146222543. The next prime is 146222581. The reversal of 146222561 is 165222641.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 131446225 + 14776336 = 11465^2 + 3844^2 .

It is a cyclic number.

It is not a de Polignac number, because 146222561 - 2⁶ = 146222497 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (146222501) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 24236 + ... + 29661.

It is an arithmetic number, because the mean of its divisors is an integer number (36569793).

Almost surely, 2^146222561 is an apocalyptic number.

It is an amenable number.

146222561 is a deficient number, since it is larger than the sum of its proper divisors (56611).

146222561 is an equidigital number, since it uses as much as digits as its factorization.

146222561 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 56610.

The product of its digits is 5760, while the sum is 29.

The square root of 146222561 is about 12092.2521062042. The cubic root of 146222561 is about 526.8311698822.

The spelling of 146222561 in words is "one hundred forty-six million, two hundred twenty-two thousand, five hundred sixty-one".