115661013 has 32 divisors (see below), whose sum is σ = 179980416. Its totient is φ = 65415168.

The previous prime is 115661011. The next prime is 115661023. The reversal of 115661013 is 310166511.

It is not a de Polignac number, because 115661013 - 2¹ = 115661011 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (115661011) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 26481 + ... + 30537.

It is an arithmetic number, because the mean of its divisors is an integer number (5624388).

Almost surely, 2^115661013 is an apocalyptic number.

115661013 is a gapful number since it is divisible by the number (13) formed by its first and last digit.

It is an amenable number.

115661013 is a deficient number, since it is larger than the sum of its proper divisors (64319403).

115661013 is a wasteful number, since it uses less digits than its factorization.

115661013 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4133.

The product of its (nonzero) digits is 540, while the sum is 24.

The square root of 115661013 is about 10754.5810239172. The cubic root of 115661013 is about 487.2243638407.

The spelling of 115661013 in words is "one hundred fifteen million, six hundred sixty-one thousand, thirteen".