894637921 has 2 divisors, whose sum is σ = 894637922. Its totient is φ = 894637920.

The previous prime is 894637847. The next prime is 894637943. The reversal of 894637921 is 129736498.

894637921 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 831514896 + 63123025 = 28836^2 + 7945^2 .

It is a cyclic number.

It is not a de Polignac number, because 894637921 - 2¹¹ = 894635873 is a prime.

It is not a weakly prime, because it can be changed into another prime (804637921) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 447318960 + 447318961.

It is an arithmetic number, because the mean of its divisors is an integer number (447318961).

Almost surely, 2^894637921 is an apocalyptic number.

It is an amenable number.

894637921 is a deficient number, since it is larger than the sum of its proper divisors (1).

894637921 is an equidigital number, since it uses as much as digits as its factorization.

894637921 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 653184, while the sum is 49.

The square root of 894637921 is about 29910.4985080490. The cubic root of 894637921 is about 963.5681453944.

The spelling of 894637921 in words is "eight hundred ninety-four million, six hundred thirty-seven thousand, nine hundred twenty-one".