121945528849 has 3 divisors (see below), whose sum is σ = 121945878057. Its totient is φ = 121945179642.

The previous prime is 121945528843. The next prime is 121945528867. The reversal of 121945528849 is 948825549121.

The square root of 121945528849 is 349207.

It is a perfect power (a square), and thus also a powerful number.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length, and also an emirpimes, since its reverse is a distinct semiprime: 948825549121 = 97553 ⋅9726257.

It is not a de Polignac number, because 121945528849 - 2⁹ = 121945528337 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 121945528793 and 121945528802.

It is not an unprimeable number, because it can be changed into a prime (121945528843) by changing a digit.

It is a polite number, since it can be written in 2 ways as a sum of consecutive naturals, for example, 174604 + ... + 523810.

It is an arithmetic number, because the mean of its divisors is an integer number (40648626019).

Almost surely, 2^121945528849 is an apocalyptic number.

121945528849 is the 349207-th square number.

121945528849 is the 174604-th centered octagonal number.

It is an amenable number.

121945528849 is a deficient number, since it is larger than the sum of its proper divisors (349208).

121945528849 is an frugal number, since it uses more digits than its factorization.

121945528849 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 698414 (or 349207 counting only the distinct ones).

The product of its digits is 8294400, while the sum is 58.

The spelling of 121945528849 in words is "one hundred twenty-one billion, nine hundred forty-five million, five hundred twenty-eight thousand, eight hundred forty-nine".