121155845 has 4 divisors (see below), whose sum is σ = 145387020. Its totient is φ = 96924672.

The previous prime is 121155803. The next prime is 121155857. The reversal of 121155845 is 548551121.

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

It can be written as a sum of positive squares in 2 ways, for example, as 31550689 + 89605156 = 5617^2 + 9466^2 .

It is a cyclic number.

It is not a de Polignac number, because 121155845 - 2⁸ = 121155589 is a prime.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 12115580 + ... + 12115589.

It is an arithmetic number, because the mean of its divisors is an integer number (36346755).

Almost surely, 2^121155845 is an apocalyptic number.

It is an amenable number.

121155845 is a deficient number, since it is larger than the sum of its proper divisors (24231175).

121155845 is an equidigital number, since it uses as much as digits as its factorization.

121155845 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 24231174.

The product of its digits is 8000, while the sum is 32.

The square root of 121155845 is about 11007.0815841439. The cubic root of 121155845 is about 494.8210011570.

The spelling of 121155845 in words is "one hundred twenty-one million, one hundred fifty-five thousand, eight hundred forty-five".