115721761 has 8 divisors (see below), whose sum is σ = 121917600. Its totient is φ = 109536480.

The previous prime is 115721759. The next prime is 115721777. The reversal of 115721761 is 167127511.

It is a happy number.

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 115721761 - 2¹ = 115721759 is a prime.

It is a super-2 number, since 2×115721761² = 26783051937882242, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (115721731) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 30930 + ... + 34468.

It is an arithmetic number, because the mean of its divisors is an integer number (15239700).

Almost surely, 2^115721761 is an apocalyptic number.

It is an amenable number.

115721761 is a deficient number, since it is larger than the sum of its proper divisors (6195839).

115721761 is a wasteful number, since it uses less digits than its factorization.

115721761 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5279.

The product of its digits is 2940, while the sum is 31.

The square root of 115721761 is about 10757.4049379950. The cubic root of 115721761 is about 487.3096496386.

The spelling of 115721761 in words is "one hundred fifteen million, seven hundred twenty-one thousand, seven hundred sixty-one".