242551521 has 6 divisors (see below), whose sum is σ = 350352210. Its totient is φ = 161701008.

The previous prime is 242551501. The next prime is 242551523. The reversal of 242551521 is 125155242.

242551521 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in only one way, i.e., 133056225 + 109495296 = 11535^2 + 10464^2 .

It is not a de Polignac number, because 242551521 - 2⁵ = 242551489 is a prime.

It is not an unprimeable number, because it can be changed into a prime (242551523) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 13475076 + ... + 13475093.

It is an arithmetic number, because the mean of its divisors is an integer number (58392035).

Almost surely, 2^242551521 is an apocalyptic number.

It is an amenable number.

242551521 is a deficient number, since it is larger than the sum of its proper divisors (107800689).

242551521 is a wasteful number, since it uses less digits than its factorization.

242551521 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 26950175 (or 26950172 counting only the distinct ones).

The product of its digits is 4000, while the sum is 27.

The square root of 242551521 is about 15574.0656541572. The cubic root of 242551521 is about 623.6410117700.

The spelling of 242551521 in words is "two hundred forty-two million, five hundred fifty-one thousand, five hundred twenty-one".