898661861 has 2 divisors, whose sum is σ = 898661862. Its totient is φ = 898661860.

The previous prime is 898661857. The next prime is 898661887. The reversal of 898661861 is 168166898.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 750431236 + 148230625 = 27394^2 + 12175^2 .

It is a cyclic number.

It is not a de Polignac number, because 898661861 - 2² = 898661857 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (898664861) 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, 449330930 + 449330931.

It is an arithmetic number, because the mean of its divisors is an integer number (449330931).

Almost surely, 2^898661861 is an apocalyptic number.

It is an amenable number.

898661861 is a deficient number, since it is larger than the sum of its proper divisors (1).

898661861 is an equidigital number, since it uses as much as digits as its factorization.

898661861 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 995328, while the sum is 53.

The square root of 898661861 is about 29977.6893872760. The cubic root of 898661861 is about 965.0106439267.

The spelling of 898661861 in words is "eight hundred ninety-eight million, six hundred sixty-one thousand, eight hundred sixty-one".