146145581 has 2 divisors, whose sum is σ = 146145582. Its totient is φ = 146145580.

The previous prime is 146145577. The next prime is 146145641. The reversal of 146145581 is 185541641.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 140896900 + 5248681 = 11870^2 + 2291^2 .

It is an emirp because it is prime and its reverse (185541641) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 146145581 - 2² = 146145577 is a prime.

It is a super-2 number, since 2×146145581² = 42717061691655122, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (146145521) by changing a digit.

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 as a sum of consecutive naturals, namely, 73072790 + 73072791.

It is an arithmetic number, because the mean of its divisors is an integer number (73072791).

Almost surely, 2^146145581 is an apocalyptic number.

It is an amenable number.

146145581 is a deficient number, since it is larger than the sum of its proper divisors (1).

146145581 is an equidigital number, since it uses as much as digits as its factorization.

146145581 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 19200, while the sum is 35.

The square root of 146145581 is about 12089.0686572622. The cubic root of 146145581 is about 526.7387022033.

The spelling of 146145581 in words is "one hundred forty-six million, one hundred forty-five thousand, five hundred eighty-one".