121648031563 has 4 divisors (see below), whose sum is σ = 128050559560. Its totient is φ = 115245503568.

The previous prime is 121648031551. The next prime is 121648031623. The reversal of 121648031563 is 365130846121.

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

It is a cyclic number.

It is not a de Polignac number, because 121648031563 - 2³³ = 113058096971 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (121648031513) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3201263970 + ... + 3201264007.

It is an arithmetic number, because the mean of its divisors is an integer number (32012639890).

Almost surely, 2^121648031563 is an apocalyptic number.

121648031563 is a deficient number, since it is larger than the sum of its proper divisors (6402527997).

121648031563 is an equidigital number, since it uses as much as digits as its factorization.

121648031563 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6402527996.

The product of its (nonzero) digits is 103680, while the sum is 40.

Adding to 121648031563 its reverse (365130846121), we get a palindrome (486778877684).

The spelling of 121648031563 in words is "one hundred twenty-one billion, six hundred forty-eight million, thirty-one thousand, five hundred sixty-three".