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115111121 = 293969349

115111121 has 4 divisors (see below), whose sum is σ = 119080500. Its totient is φ = 111141744.

The previous prime is 115111111. The next prime is 115111127. The reversal of 115111121 is 121111511.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 121111511 = 294176259.

It can be written as a sum of positive squares in 2 ways, for example, as 55651600 + 59459521 = 7460^2 + 7711^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2k-115111121 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 115111096 and 115111105.

It is not an unprimeable number, because it can be changed into a prime (115111127) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1984646 + ... + 1984703.

It is an arithmetic number, because the mean of its divisors is an integer number (29770125).

Almost surely, 2115111121 is an apocalyptic number.

It is an amenable number.

115111121 is a deficient number, since it is larger than the sum of its proper divisors (3969379).

115111121 is an equidigital number, since it uses as much as digits as its factorization.

115111121 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3969378.

The product of its digits is 10, while the sum is 14.

The square root of 115111121 is about 10728.9850871366. The cubic root of 115111121 is about 486.4509931844.

Adding to 115111121 its reverse (121111511), we get a palindrome (236222632).

The spelling of 115111121 in words is "one hundred fifteen million, one hundred eleven thousand, one hundred twenty-one".

Divisors: 1 29 3969349 115111121