115131721 has 8 divisors (see below), whose sum is σ = 120294720. Its totient is φ = 109981872.

The previous prime is 115131703. The next prime is 115131727. The reversal of 115131721 is 127131511.

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 115131721 - 2⁵ = 115131689 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 115131692 and 115131701.

It is not an unprimeable number, because it can be changed into a prime (115131727) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 17475 + ... + 23143.

It is an arithmetic number, because the mean of its divisors is an integer number (15036840).

Almost surely, 2^115131721 is an apocalyptic number.

It is an amenable number.

115131721 is a deficient number, since it is larger than the sum of its proper divisors (5162999).

115131721 is an equidigital number, since it uses as much as digits as its factorization.

115131721 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6575.

The product of its digits is 210, while the sum is 22.

The square root of 115131721 is about 10729.9450604372. The cubic root of 115131721 is about 486.4800094737.

Subtracting from 115131721 its product of digits (210), we obtain a palindrome (115131511).

The spelling of 115131721 in words is "one hundred fifteen million, one hundred thirty-one thousand, seven hundred twenty-one".