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13191979 is a prime number
BaseRepresentation
bin110010010100…
…101100101011
3220211012222211
4302110230223
511334120404
61150425551
7220062403
oct62245453
926735884
1013191979
1174a0369
1245022b7
13296b708
141a75803
151258b04
hexc94b2b

13191979 has 2 divisors, whose sum is σ = 13191980. Its totient is φ = 13191978.

The previous prime is 13191977. The next prime is 13191991. The reversal of 13191979 is 97919131.

13191979 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 is a cyclic number.

It is not a de Polignac number, because 13191979 - 21 = 13191977 is a prime.

It is a super-3 number, since 3×131919793 (a number of 22 digits) contains 333 as substring.

Together with 13191977, it forms a pair of twin primes.

It is equal to p860899 and since 13191979 and 860899 have the same sum of digits, it is a Honaker prime.

It is not a weakly prime, because it can be changed into another prime (13191977) by changing a digit.

It is an upside-down number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6595989 + 6595990.

It is an arithmetic number, because the mean of its divisors is an integer number (6595990).

Almost surely, 213191979 is an apocalyptic number.

13191979 is a deficient number, since it is larger than the sum of its proper divisors (1).

13191979 is an equidigital number, since it uses as much as digits as its factorization.

13191979 is an evil number, because the sum of its binary digits is even.

The product of its digits is 15309, while the sum is 40.

The square root of 13191979 is about 3632.0764033814. The cubic root of 13191979 is about 236.2852709953.

The spelling of 13191979 in words is "thirteen million, one hundred ninety-one thousand, nine hundred seventy-nine".