242220551 has 4 divisors (see below), whose sum is σ = 242252712. Its totient is φ = 242188392.

The previous prime is 242220491. The next prime is 242220571. The reversal of 242220551 is 155022242.

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.

It is a cyclic number.

It is not a de Polignac number, because 242220551 - 2⁶ = 242220487 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (242220571) 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 3 ways as a sum of consecutive naturals, for example, 1976 + ... + 22098.

It is an arithmetic number, because the mean of its divisors is an integer number (60563178).

Almost surely, 2^242220551 is an apocalyptic number.

242220551 is a deficient number, since it is larger than the sum of its proper divisors (32161).

242220551 is a wasteful number, since it uses less digits than its factorization.

242220551 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 32160.

The product of its (nonzero) digits is 1600, while the sum is 23.

The square root of 242220551 is about 15563.4363493414. The cubic root of 242220551 is about 623.3572226888.

Adding to 242220551 its reverse (155022242), we get a palindrome (397242793).

The spelling of 242220551 in words is "two hundred forty-two million, two hundred twenty thousand, five hundred fifty-one".