115661011 has 2 divisors, whose sum is σ = 115661012. Its totient is φ = 115661010.

The previous prime is 115661009. The next prime is 115661023. The reversal of 115661011 is 110166511.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 115661011 - 2¹ = 115661009 is a prime.

Together with 115661009, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (115661071) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 57830505 + 57830506.

It is an arithmetic number, because the mean of its divisors is an integer number (57830506).

Almost surely, 2^115661011 is an apocalyptic number.

115661011 is a deficient number, since it is larger than the sum of its proper divisors (1).

115661011 is an equidigital number, since it uses as much as digits as its factorization.

115661011 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 180, while the sum is 22.

The square root of 115661011 is about 10754.5809309336. The cubic root of 115661011 is about 487.2243610324.

The spelling of 115661011 in words is "one hundred fifteen million, six hundred sixty-one thousand, eleven".