920840881 has 2 divisors, whose sum is σ = 920840882. Its totient is φ = 920840880.

The previous prime is 920840861. The next prime is 920840891. The reversal of 920840881 is 188048029.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 836366400 + 84474481 = 28920^2 + 9191^2 .

It is a cyclic number.

It is not a de Polignac number, because 920840881 - 2¹⁵ = 920808113 is a prime.

It is a super-2 number, since 2×920840881² = 1695895856241712322, which contains 22 as substring.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (920840821) 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, 460420440 + 460420441.

It is an arithmetic number, because the mean of its divisors is an integer number (460420441).

Almost surely, 2^920840881 is an apocalyptic number.

It is an amenable number.

920840881 is a deficient number, since it is larger than the sum of its proper divisors (1).

920840881 is an equidigital number, since it uses as much as digits as its factorization.

920840881 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 36864, while the sum is 40.

The square root of 920840881 is about 30345.3601230897. The cubic root of 920840881 is about 972.8850517351.

The spelling of 920840881 in words is "nine hundred twenty million, eight hundred forty thousand, eight hundred eighty-one".