121148555439 has 4 divisors (see below), whose sum is σ = 161531407256. Its totient is φ = 80765703624.

The previous prime is 121148555357. The next prime is 121148555483. The reversal of 121148555439 is 934555841121.

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

It is not a de Polignac number, because 121148555439 - 2²⁹ = 120611684527 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (121148555239) 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, 20191425904 + ... + 20191425909.

It is an arithmetic number, because the mean of its divisors is an integer number (40382851814).

Almost surely, 2^121148555439 is an apocalyptic number.

121148555439 is a deficient number, since it is larger than the sum of its proper divisors (40382851817).

121148555439 is an equidigital number, since it uses as much as digits as its factorization.

121148555439 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 40382851816.

The product of its digits is 864000, while the sum is 48.

The spelling of 121148555439 in words is "one hundred twenty-one billion, one hundred forty-eight million, five hundred fifty-five thousand, four hundred thirty-nine".