146636821 has 2 divisors, whose sum is σ = 146636822. Its totient is φ = 146636820.

The previous prime is 146636807. The next prime is 146636827. The reversal of 146636821 is 128636641.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 135839025 + 10797796 = 11655^2 + 3286^2 .

It is a cyclic number.

It is not a de Polignac number, because 146636821 - 2⁹ = 146636309 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (146636827) 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, 73318410 + 73318411.

It is an arithmetic number, because the mean of its divisors is an integer number (73318411).

Almost surely, 2^146636821 is an apocalyptic number.

It is an amenable number.

146636821 is a deficient number, since it is larger than the sum of its proper divisors (1).

146636821 is an equidigital number, since it uses as much as digits as its factorization.

146636821 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 41472, while the sum is 37.

The square root of 146636821 is about 12109.3691412889. The cubic root of 146636821 is about 527.3282188120.

The spelling of 146636821 in words is "one hundred forty-six million, six hundred thirty-six thousand, eight hundred twenty-one".