115440120231 has 4 divisors (see below), whose sum is σ = 153920160312. Its totient is φ = 76960080152.

The previous prime is 115440120217. The next prime is 115440120283. The reversal of 115440120231 is 132021044511.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-115440120231 is a prime.

It is a super-2 number, since 2×115440120231² (a number of 23 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (115440120931) 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, 19240020036 + ... + 19240020041.

It is an arithmetic number, because the mean of its divisors is an integer number (38480040078).

Almost surely, 2^115440120231 is an apocalyptic number.

115440120231 is a deficient number, since it is larger than the sum of its proper divisors (38480040081).

115440120231 is an equidigital number, since it uses as much as digits as its factorization.

115440120231 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 38480040080.

The product of its (nonzero) digits is 960, while the sum is 24.

Adding to 115440120231 its reverse (132021044511), we get a palindrome (247461164742).

The spelling of 115440120231 in words is "one hundred fifteen billion, four hundred forty million, one hundred twenty thousand, two hundred thirty-one".