921853081 has 2 divisors, whose sum is σ = 921853082. Its totient is φ = 921853080.

The previous prime is 921853069. The next prime is 921853117. The reversal of 921853081 is 180358129.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 912342025 + 9511056 = 30205^2 + 3084^2 .

It is a cyclic number.

It is not a de Polignac number, because 921853081 - 2¹⁵ = 921820313 is a prime.

It is a super-2 number, since 2×921853081² = 1699626205898385122, which contains 22 as substring.

It is equal to p_47069407 and since 921853081 and 47069407 have the same sum of digits, it is a Honaker prime.

It is a self number, because there is not a number n which added to its sum of digits gives 921853081.

It is not a weakly prime, because it can be changed into another prime (921853021) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 460926540 + 460926541.

It is an arithmetic number, because the mean of its divisors is an integer number (460926541).

Almost surely, 2^921853081 is an apocalyptic number.

It is an amenable number.

921853081 is a deficient number, since it is larger than the sum of its proper divisors (1).

921853081 is an equidigital number, since it uses as much as digits as its factorization.

921853081 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 17280, while the sum is 37.

The square root of 921853081 is about 30362.0335452025. The cubic root of 921853081 is about 973.2413904077.

It can be divided in two parts, 92185 and 3081, that added together give a triangular number (95266 = T₄₃₆).

The spelling of 921853081 in words is "nine hundred twenty-one million, eight hundred fifty-three thousand, eighty-one".