10205989 has 2 divisors, whose sum is σ = 10205990. Its totient is φ = 10205988.

The previous prime is 10205963. The next prime is 10206019. The reversal of 10205989 is 98950201.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 6461764 + 3744225 = 2542^2 + 1935^2 .

It is a cyclic number.

It is not a de Polignac number, because 10205989 - 2⁷ = 10205861 is a prime.

It is a super-2 number, since 2×10205989² = 208324422936242, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (10205089) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5102994 + 5102995.

It is an arithmetic number, because the mean of its divisors is an integer number (5102995).

Almost surely, 2^10205989 is an apocalyptic number.

It is an amenable number.

10205989 is a deficient number, since it is larger than the sum of its proper divisors (1).

10205989 is an equidigital number, since it uses as much as digits as its factorization.

10205989 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 6480, while the sum is 34.

The square root of 10205989 is about 3194.6813612628. The cubic root of 10205989 is about 216.9127258464.

The spelling of 10205989 in words is "ten million, two hundred five thousand, nine hundred eighty-nine".