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9991973 is a prime number
BaseRepresentation
bin100110000111…
…011100100101
3200210122102002
4212013130211
510024220343
6554055045
7150634055
oct46073445
920718362
109991973
115705132
12341a485
1320bb014
141481565
15d258b8
hex987725

9991973 has 2 divisors, whose sum is σ = 9991974. Its totient is φ = 9991972.

The previous prime is 9991963. The next prime is 9991997. The reversal of 9991973 is 3791999.

It is a happy number.

9991973 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 6240004 + 3751969 = 2498^2 + 1937^2 .

It is a cyclic number.

It is not a de Polignac number, because 9991973 - 210 = 9990949 is a prime.

It is a Sophie Germain prime.

It is a Curzon number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (9991963) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 4995986 + 4995987.

It is an arithmetic number, because the mean of its divisors is an integer number (4995987).

Almost surely, 29991973 is an apocalyptic number.

It is an amenable number.

9991973 is a deficient number, since it is larger than the sum of its proper divisors (1).

9991973 is an equidigital number, since it uses as much as digits as its factorization.

9991973 is an evil number, because the sum of its binary digits is even.

The product of its digits is 137781, while the sum is 47.

The square root of 9991973 is about 3161.0082252345. The cubic root of 9991973 is about 215.3858080814.

The spelling of 9991973 in words is "nine million, nine hundred ninety-one thousand, nine hundred seventy-three".