242497321257 has 4 divisors (see below), whose sum is σ = 323329761680. Its totient is φ = 161664880836.

The previous prime is 242497321247. The next prime is 242497321273. The reversal of 242497321257 is 752123794242.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is not a de Polignac number, because 242497321257 - 2²⁷ = 242363103529 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (242497321247) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 40416220207 + ... + 40416220212.

It is an arithmetic number, because the mean of its divisors is an integer number (80832440420).

Almost surely, 2^242497321257 is an apocalyptic number.

It is an amenable number.

242497321257 is a deficient number, since it is larger than the sum of its proper divisors (80832440423).

242497321257 is an equidigital number, since it uses as much as digits as its factorization.

242497321257 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 80832440422.

The product of its digits is 1693440, while the sum is 48.

The spelling of 242497321257 in words is "two hundred forty-two billion, four hundred ninety-seven million, three hundred twenty-one thousand, two hundred fifty-seven".