243121077 has 12 divisors (see below), whose sum is σ = 352647360. Its totient is φ = 161401128.

The previous prime is 243121057. The next prime is 243121079. The reversal of 243121077 is 770121342.

It is a happy number.

It is not a de Polignac number, because 243121077 - 2¹² = 243116981 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 243121077.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (243121079) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 54363 + ... + 58664.

It is an arithmetic number, because the mean of its divisors is an integer number (29387280).

Almost surely, 2^243121077 is an apocalyptic number.

It is an amenable number.

243121077 is a deficient number, since it is larger than the sum of its proper divisors (109526283).

243121077 is a wasteful number, since it uses less digits than its factorization.

243121077 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 113272 (or 113269 counting only the distinct ones).

The product of its (nonzero) digits is 2352, while the sum is 27.

The square root of 243121077 is about 15592.3403310728. The cubic root of 243121077 is about 624.1287718093.

The spelling of 243121077 in words is "two hundred forty-three million, one hundred twenty-one thousand, seventy-seven".