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139121 is a prime number
BaseRepresentation
bin100001111101110001
321001211122
4201331301
513422441
62552025
71116413
oct417561
9231748
10139121
1195584
1268615
134b428
14389b3
152b34b
hex21f71

139121 has 2 divisors, whose sum is σ = 139122. Its totient is φ = 139120.

The previous prime is 139109. The next prime is 139123. The reversal of 139121 is 121931.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 112225 + 26896 = 335^2 + 164^2 .

It is an emirp because it is prime and its reverse (121931) is a distict prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2k-139121 is a prime.

Together with 139123, it forms a pair of twin primes.

It is a Chen prime.

It is a self number, because there is not a number n which added to its sum of digits gives 139121.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 139121.

It is not a weakly prime, because it can be changed into another prime (139123) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 69560 + 69561.

It is an arithmetic number, because the mean of its divisors is an integer number (69561).

2139121 is an apocalyptic number.

It is an amenable number.

139121 is a deficient number, since it is larger than the sum of its proper divisors (1).

139121 is an equidigital number, since it uses as much as digits as its factorization.

139121 is an evil number, because the sum of its binary digits is even.

The product of its digits is 54, while the sum is 17.

The square root of 139121 is about 372.9892759852. The cubic root of 139121 is about 51.8160413043.

The spelling of 139121 in words is "one hundred thirty-nine thousand, one hundred twenty-one".