920323981 has 2 divisors, whose sum is σ = 920323982. Its totient is φ = 920323980.

The previous prime is 920323933. The next prime is 920324021. The reversal of 920323981 is 189323029.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 472366756 + 447957225 = 21734^2 + 21165^2 .

It is a cyclic number.

It is not a de Polignac number, because 920323981 - 2²³ = 911935373 is a prime.

It is a super-2 number, since 2×920323981² = 1693992460007376722, which contains 22 as substring.

It is a Chen prime.

It is a self number, because there is not a number n which added to its sum of digits gives 920323981.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (920323931) 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, 460161990 + 460161991.

It is an arithmetic number, because the mean of its divisors is an integer number (460161991).

Almost surely, 2^920323981 is an apocalyptic number.

It is an amenable number.

920323981 is a deficient number, since it is larger than the sum of its proper divisors (1).

920323981 is an equidigital number, since it uses as much as digits as its factorization.

920323981 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 23328, while the sum is 37.

The square root of 920323981 is about 30336.8419747343. The cubic root of 920323981 is about 972.7029795956.

The spelling of 920323981 in words is "nine hundred twenty million, three hundred twenty-three thousand, nine hundred eighty-one".