152821 has 2 divisors, whose sum is σ = 152822. Its totient is φ = 152820.

The previous prime is 152819. The next prime is 152833. The reversal of 152821 is 128251.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 130321 + 22500 = 361^2 + 150^2 .

It is a cyclic number.

It is not a de Polignac number, because 152821 - 2¹ = 152819 is a prime.

Together with 152819, 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 (152851) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 76410 + 76411.

It is an arithmetic number, because the mean of its divisors is an integer number (76411).

2¹⁵²⁸²¹ is an apocalyptic number.

It is an amenable number.

152821 is a deficient number, since it is larger than the sum of its proper divisors (1).

152821 is an equidigital number, since it uses as much as digits as its factorization.

152821 is an evil number, because the sum of its binary digits is even.

The product of its digits is 160, while the sum is 19.

The square root of 152821 is about 390.9232661278. The cubic root of 152821 is about 53.4639463614.

The spelling of 152821 in words is "one hundred fifty-two thousand, eight hundred twenty-one".