146999821 has 2 divisors, whose sum is σ = 146999822. Its totient is φ = 146999820.

The previous prime is 146999819. The next prime is 146999851. The reversal of 146999821 is 128999641.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 77193796 + 69806025 = 8786^2 + 8355^2 .

It is a cyclic number.

It is not a de Polignac number, because 146999821 - 2¹ = 146999819 is a prime.

Together with 146999819, it forms a pair of twin primes.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (146999851) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 73499910 + 73499911.

It is an arithmetic number, because the mean of its divisors is an integer number (73499911).

Almost surely, 2^146999821 is an apocalyptic number.

It is an amenable number.

146999821 is a deficient number, since it is larger than the sum of its proper divisors (1).

146999821 is an equidigital number, since it uses as much as digits as its factorization.

146999821 is an evil number, because the sum of its binary digits is even.

The product of its digits is 279936, while the sum is 49.

The square root of 146999821 is about 12124.3482711443. The cubic root of 146999821 is about 527.7629945735.

The spelling of 146999821 in words is "one hundred forty-six million, nine hundred ninety-nine thousand, eight hundred twenty-one".