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115111391 is a prime number
BaseRepresentation
bin1101101110001…
…11010111011111
322000121021010212
412313013113133
5213432031031
615231123035
72565300503
oct667072737
9260537125
10115111391
1159a8298a
123267347b
131ab04a65
1411406303
15a18c12b
hex6dc75df

115111391 has 2 divisors, whose sum is σ = 115111392. Its totient is φ = 115111390.

The previous prime is 115111379. The next prime is 115111393. The reversal of 115111391 is 193111511.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 115111391 - 26 = 115111327 is a prime.

Together with 115111393, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (115111393) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 57555695 + 57555696.

It is an arithmetic number, because the mean of its divisors is an integer number (57555696).

Almost surely, 2115111391 is an apocalyptic number.

115111391 is a deficient number, since it is larger than the sum of its proper divisors (1).

115111391 is an equidigital number, since it uses as much as digits as its factorization.

115111391 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 135, while the sum is 23.

The square root of 115111391 is about 10728.9976698665. The cubic root of 115111391 is about 486.4513735174.

The spelling of 115111391 in words is "one hundred fifteen million, one hundred eleven thousand, three hundred ninety-one".