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999961 is a prime number
BaseRepresentation
bin11110100001000011001
31212210200121
43310020121
5223444321
633233241
711333224
oct3641031
91783617
10999961
11623316
12402821
132901c1
141c05bb
1514b441
hexf4219

999961 has 2 divisors, whose sum is σ = 999962. Its totient is φ = 999960.

The previous prime is 999959. The next prime is 999979. The reversal of 999961 is 169999.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 585225 + 414736 = 765^2 + 644^2 .

It is a cyclic number.

It is not a de Polignac number, because 999961 - 21 = 999959 is a prime.

Together with 999959, it forms a pair of twin primes.

It is an Ulam number.

It is a nialpdrome in base 10.

It is not a weakly prime, because it can be changed into another prime (999931) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 499980 + 499981.

It is an arithmetic number, because the mean of its divisors is an integer number (499981).

2999961 is an apocalyptic number.

It is an amenable number.

999961 is a deficient number, since it is larger than the sum of its proper divisors (1).

999961 is an equidigital number, since it uses as much as digits as its factorization.

999961 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 39366, while the sum is 43.

The square root of 999961 is about 999.9804998099. The cubic root of 999961 is about 99.9986999831.

The spelling of 999961 in words is "nine hundred ninety-nine thousand, nine hundred sixty-one".