146181821 has 2 divisors, whose sum is σ = 146181822. Its totient is φ = 146181820.

The previous prime is 146181817. The next prime is 146181853. The reversal of 146181821 is 128181641.

It is a happy number.

It is an a-pointer prime, because the next prime (146181853) can be obtained adding 146181821 to its sum of digits (32).

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 132595225 + 13586596 = 11515^2 + 3686^2 .

It is a cyclic number.

It is not a de Polignac number, because 146181821 - 2² = 146181817 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (146181121) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 73090910 + 73090911.

It is an arithmetic number, because the mean of its divisors is an integer number (73090911).

Almost surely, 2^146181821 is an apocalyptic number.

It is an amenable number.

146181821 is a deficient number, since it is larger than the sum of its proper divisors (1).

146181821 is an equidigital number, since it uses as much as digits as its factorization.

146181821 is an evil number, because the sum of its binary digits is even.

The product of its digits is 3072, while the sum is 32.

The square root of 146181821 is about 12090.5674391238. The cubic root of 146181821 is about 526.7822374070.

The spelling of 146181821 in words is "one hundred forty-six million, one hundred eighty-one thousand, eight hundred twenty-one".