242217631 has 4 divisors (see below), whose sum is σ = 242265064. Its totient is φ = 242170200.

The previous prime is 242217587. The next prime is 242217653. The reversal of 242217631 is 136712242.

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

It is a cyclic number.

It is not a de Polignac number, because 242217631 - 2¹³ = 242209439 is a prime.

It is a super-2 number, since 2×242217631² = 117338761534504322, which contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 242217631.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (242217691) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 14985 + ... + 26626.

It is an arithmetic number, because the mean of its divisors is an integer number (60566266).

Almost surely, 2^242217631 is an apocalyptic number.

242217631 is the 8986-th hex number.

242217631 is a deficient number, since it is larger than the sum of its proper divisors (47433).

242217631 is an equidigital number, since it uses as much as digits as its factorization.

242217631 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 47432.

The product of its digits is 4032, while the sum is 28.

The square root of 242217631 is about 15563.3425394418. The cubic root of 242217631 is about 623.3547177948.

Adding to 242217631 its reverse (136712242), we get a palindrome (378929873).

The spelling of 242217631 in words is "two hundred forty-two million, two hundred seventeen thousand, six hundred thirty-one".