242020251 has 16 divisors (see below), whose sum is σ = 391144320. Its totient is φ = 146678760.

The previous prime is 242020231. The next prime is 242020277. The reversal of 242020251 is 152020242.

It is not a de Polignac number, because 242020251 - 2⁶ = 242020187 is a prime.

It is not an unprimeable number, because it can be changed into a prime (242020201) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 407145 + ... + 407738.

It is an arithmetic number, because the mean of its divisors is an integer number (24446520).

Almost surely, 2^242020251 is an apocalyptic number.

242020251 is a deficient number, since it is larger than the sum of its proper divisors (149124069).

242020251 is a wasteful number, since it uses less digits than its factorization.

242020251 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 814903 (or 814897 counting only the distinct ones).

The product of its (nonzero) digits is 320, while the sum is 18.

The square root of 242020251 is about 15557.0000642797. Note that the first 4 decimals coincide. The cubic root of 242020251 is about 623.1853505617.

Adding to 242020251 its reverse (152020242), we get a palindrome (394040493).

Subtracting from 242020251 its reverse (152020242), we obtain a palindrome (90000009).

The spelling of 242020251 in words is "two hundred forty-two million, twenty thousand, two hundred fifty-one".