899997961 has 2 divisors, whose sum is σ = 899997962. Its totient is φ = 899997960.

The previous prime is 899997949. The next prime is 899997991. The reversal of 899997961 is 169799998.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 830592400 + 69405561 = 28820^2 + 8331^2 .

It is a cyclic number.

It is not a de Polignac number, because 899997961 - 2¹⁷ = 899866889 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (899997911) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 449998980 + 449998981.

It is an arithmetic number, because the mean of its divisors is an integer number (449998981).

Almost surely, 2^899997961 is an apocalyptic number.

It is an amenable number.

899997961 is a deficient number, since it is larger than the sum of its proper divisors (1).

899997961 is an equidigital number, since it uses as much as digits as its factorization.

899997961 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 19840464, while the sum is 67.

The square root of 899997961 is about 29999.9660166474. The cubic root of 899997961 is about 965.4886554818.

The spelling of 899997961 in words is "eight hundred ninety-nine million, nine hundred ninety-seven thousand, nine hundred sixty-one".