115127721 has 6 divisors (see below), whose sum is σ = 166295610. Its totient is φ = 76751808.

The previous prime is 115127717. The next prime is 115127729. The reversal of 115127721 is 127721511.

It can be written as a sum of positive squares in only one way, i.e., 110565225 + 4562496 = 10515^2 + 2136^2 .

It is not a de Polignac number, because 115127721 - 2² = 115127717 is a prime.

It is not an unprimeable number, because it can be changed into a prime (115127729) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 6395976 + ... + 6395993.

It is an arithmetic number, because the mean of its divisors is an integer number (27715935).

Almost surely, 2^115127721 is an apocalyptic number.

It is an amenable number.

115127721 is a deficient number, since it is larger than the sum of its proper divisors (51167889).

115127721 is a wasteful number, since it uses less digits than its factorization.

115127721 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12791975 (or 12791972 counting only the distinct ones).

The product of its digits is 980, while the sum is 27.

The square root of 115127721 is about 10729.7586645740. The cubic root of 115127721 is about 486.4743755136.

The spelling of 115127721 in words is "one hundred fifteen million, one hundred twenty-seven thousand, seven hundred twenty-one".