181052821 has 2 divisors, whose sum is σ = 181052822. Its totient is φ = 181052820.

The previous prime is 181052779. The next prime is 181052831. The reversal of 181052821 is 128250181.

181052821 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 108972721 + 72080100 = 10439^2 + 8490^2 .

It is a cyclic number.

It is not a de Polignac number, because 181052821 - 2¹³ = 181044629 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 181052821.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (181052831) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 90526410 + 90526411.

It is an arithmetic number, because the mean of its divisors is an integer number (90526411).

Almost surely, 2^181052821 is an apocalyptic number.

It is an amenable number.

181052821 is a deficient number, since it is larger than the sum of its proper divisors (1).

181052821 is an equidigital number, since it uses as much as digits as its factorization.

181052821 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1280, while the sum is 28.

The square root of 181052821 is about 13455.5869808790. The cubic root of 181052821 is about 565.7203030240.

The spelling of 181052821 in words is "one hundred eighty-one million, fifty-two thousand, eight hundred twenty-one".