115243721 has 8 divisors (see below), whose sum is σ = 123019200. Its totient is φ = 107639280.

The previous prime is 115243717. The next prime is 115243729. The reversal of 115243721 is 127342511.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 115243721 - 2² = 115243717 is a prime.

It is a super-2 number, since 2×115243721² = 26562230459851682, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (115243729) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 41366 + ... + 44063.

It is an arithmetic number, because the mean of its divisors is an integer number (15377400).

Almost surely, 2^115243721 is an apocalyptic number.

It is an amenable number.

115243721 is a deficient number, since it is larger than the sum of its proper divisors (7775479).

115243721 is an equidigital number, since it uses as much as digits as its factorization.

115243721 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 85519.

The product of its digits is 1680, while the sum is 26.

The square root of 115243721 is about 10735.1628306235. The cubic root of 115243721 is about 486.6377074051.

The spelling of 115243721 in words is "one hundred fifteen million, two hundred forty-three thousand, seven hundred twenty-one".