921795857 has 2 divisors, whose sum is σ = 921795858. Its totient is φ = 921795856.

The previous prime is 921795821. The next prime is 921795877. The reversal of 921795857 is 758597129.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 895745041 + 26050816 = 29929^2 + 5104^2 .

It is a cyclic number.

It is not a de Polignac number, because 921795857 - 2⁶ = 921795793 is a prime.

It is a Chen prime.

It is a junction number, because it is equal to n+sod(n) for n = 921795799 and 921795808.

It is not a weakly prime, because it can be changed into another prime (921795877) 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, 460897928 + 460897929.

It is an arithmetic number, because the mean of its divisors is an integer number (460897929).

Almost surely, 2^921795857 is an apocalyptic number.

It is an amenable number.

921795857 is a deficient number, since it is larger than the sum of its proper divisors (1).

921795857 is an equidigital number, since it uses as much as digits as its factorization.

921795857 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 1587600, while the sum is 53.

The square root of 921795857 is about 30361.0911694557. The cubic root of 921795857 is about 973.2212520151.

The spelling of 921795857 in words is "nine hundred twenty-one million, seven hundred ninety-five thousand, eight hundred fifty-seven".