115661120 has 28 divisors (see below), whose sum is σ = 275418804. Its totient is φ = 46264320.

The previous prime is 115661111. The next prime is 115661129. The reversal of 115661120 is 21166511.

It is an interprime number because it is at equal distance from previous prime (115661111) and next prime (115661129).

It can be written as a sum of positive squares in 2 ways, for example, as 35236096 + 80425024 = 5936^2 + 8968^2 .

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (115661129) 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, 180401 + ... + 181040.

Almost surely, 2^115661120 is an apocalyptic number.

115661120 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

115661120 is an abundant number, since it is smaller than the sum of its proper divisors (159757684).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

115661120 is an equidigital number, since it uses as much as digits as its factorization.

115661120 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 361458 (or 361448 counting only the distinct ones).

The product of its (nonzero) digits is 360, while the sum is 23.

The square root of 115661120 is about 10754.5859985403. The cubic root of 115661120 is about 487.2245140872.

The spelling of 115661120 in words is "one hundred fifteen million, six hundred sixty-one thousand, one hundred twenty".