242878631 has 4 divisors (see below), whose sum is σ = 242927664. Its totient is φ = 242829600.

The previous prime is 242878613. The next prime is 242878661. The reversal of 242878631 is 136878242.

242878631 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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 242878631 - 2¹⁸ = 242616487 is a prime.

It is a super-2 number, since 2×242878631² = 117980058792868322, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (242878661) 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, 16130 + ... + 27311.

It is an arithmetic number, because the mean of its divisors is an integer number (60731916).

Almost surely, 2^242878631 is an apocalyptic number.

242878631 is a deficient number, since it is larger than the sum of its proper divisors (49033).

242878631 is an equidigital number, since it uses as much as digits as its factorization.

242878631 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 49032.

The product of its digits is 129024, while the sum is 41.

The square root of 242878631 is about 15584.5638694190. The cubic root of 242878631 is about 623.9212375592.

The spelling of 242878631 in words is "two hundred forty-two million, eight hundred seventy-eight thousand, six hundred thirty-one".