921052981 has 2 divisors, whose sum is σ = 921052982. Its totient is φ = 921052980.

The previous prime is 921052939. The next prime is 921052999. The reversal of 921052981 is 189250129.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 660747025 + 260305956 = 25705^2 + 16134^2 .

It is a cyclic number.

It is not a de Polignac number, because 921052981 - 2¹⁵ = 921020213 is a prime.

It is a super-2 number, since 2×921052981² = 1696677187617972722, which contains 22 as substring.

It is an alternating number because its digits alternate between odd and even.

It is a self number, because there is not a number n which added to its sum of digits gives 921052981.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (921052931) 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, 460526490 + 460526491.

It is an arithmetic number, because the mean of its divisors is an integer number (460526491).

Almost surely, 2^921052981 is an apocalyptic number.

It is an amenable number.

921052981 is a deficient number, since it is larger than the sum of its proper divisors (1).

921052981 is an equidigital number, since it uses as much as digits as its factorization.

921052981 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 12960, while the sum is 37.

The square root of 921052981 is about 30348.8546900867. The cubic root of 921052981 is about 972.9597418301.

The spelling of 921052981 in words is "nine hundred twenty-one million, fifty-two thousand, nine hundred eighty-one".