1820521133 has 2 divisors, whose sum is σ = 1820521134. Its totient is φ = 1820521132.

The previous prime is 1820521117. The next prime is 1820521141. The reversal of 1820521133 is 3311250281.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1273990249 + 546530884 = 35693^2 + 23378^2 .

It is a cyclic number.

It is not a de Polignac number, because 1820521133 - 2⁴ = 1820521117 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1820521193) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 910260566 + 910260567.

It is an arithmetic number, because the mean of its divisors is an integer number (910260567).

Almost surely, 2^1820521133 is an apocalyptic number.

It is an amenable number.

1820521133 is a deficient number, since it is larger than the sum of its proper divisors (1).

1820521133 is an equidigital number, since it uses as much as digits as its factorization.

1820521133 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1440, while the sum is 26.

The square root of 1820521133 is about 42667.5653512126. The cubic root of 1820521133 is about 1221.0456709467.

The spelling of 1820521133 in words is "one billion, eight hundred twenty million, five hundred twenty-one thousand, one hundred thirty-three".