115648417921 has 4 divisors (see below), whose sum is σ = 122451266052. Its totient is φ = 108845569792.

The previous prime is 115648417901. The next prime is 115648417931. The reversal of 115648417921 is 129714846511.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 129714846511 = 101 ⋅1284305411.

It can be written as a sum of positive squares in 2 ways, for example, as 100385050896 + 15263367025 = 316836^2 + 123545^2 .

It is not a de Polignac number, because 115648417921 - 2⁷ = 115648417793 is a prime.

It is a Smith number, since the sum of its digits (49) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (115648417901) 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, 3401424040 + ... + 3401424073.

It is an arithmetic number, because the mean of its divisors is an integer number (30612816513).

Almost surely, 2^115648417921 is an apocalyptic number.

It is an amenable number.

115648417921 is a deficient number, since it is larger than the sum of its proper divisors (6802848131).

115648417921 is an equidigital number, since it uses as much as digits as its factorization.

115648417921 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6802848130.

The product of its digits is 483840, while the sum is 49.

The spelling of 115648417921 in words is "one hundred fifteen billion, six hundred forty-eight million, four hundred seventeen thousand, nine hundred twenty-one".