242873977897 has 4 divisors (see below), whose sum is σ = 243150916036. Its totient is φ = 242597039760.

The previous prime is 242873977891. The next prime is 242873977903. The reversal of 242873977897 is 798779378242.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 798779378242 = 2 ⋅399389689121.

It is an interprime number because it is at equal distance from previous prime (242873977891) and next prime (242873977903).

It can be written as a sum of positive squares in 2 ways, for example, as 196478541081 + 46395436816 = 443259^2 + 215396^2 .

It is a cyclic number.

It is not a de Polignac number, because 242873977897 - 2¹⁵ = 242873945129 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (242873977891) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 138467754 + ... + 138469507.

It is an arithmetic number, because the mean of its divisors is an integer number (60787729009).

Almost surely, 2^242873977897 is an apocalyptic number.

It is an amenable number.

242873977897 is a deficient number, since it is larger than the sum of its proper divisors (276938139).

242873977897 is an equidigital number, since it uses as much as digits as its factorization.

242873977897 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 276938138.

The product of its digits is 597445632, while the sum is 73.

The spelling of 242873977897 in words is "two hundred forty-two billion, eight hundred seventy-three million, nine hundred seventy-seven thousand, eight hundred ninety-seven".