894871661 has 2 divisors, whose sum is σ = 894871662. Its totient is φ = 894871660.

The previous prime is 894871651. The next prime is 894871669. The reversal of 894871661 is 166178498.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 686964100 + 207907561 = 26210^2 + 14419^2 .

It is a cyclic number.

It is not a de Polignac number, because 894871661 - 2¹⁸ = 894609517 is a prime.

It is a super-3 number, since 3×894871661³ (a number of 28 digits) contains 333 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (894871669) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 447435830 + 447435831.

It is an arithmetic number, because the mean of its divisors is an integer number (447435831).

Almost surely, 2^894871661 is an apocalyptic number.

It is an amenable number.

894871661 is a deficient number, since it is larger than the sum of its proper divisors (1).

894871661 is an equidigital number, since it uses as much as digits as its factorization.

894871661 is an evil number, because the sum of its binary digits is even.

The product of its digits is 580608, while the sum is 50.

The square root of 894871661 is about 29914.4055765780. The cubic root of 894871661 is about 963.6520545011.

The spelling of 894871661 in words is "eight hundred ninety-four million, eight hundred seventy-one thousand, six hundred sixty-one".