242761657 has 4 divisors (see below), whose sum is σ = 243482356. Its totient is φ = 242040960.

The previous prime is 242761633. The next prime is 242761661. The reversal of 242761657 is 756167242.

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

It can be written as a sum of positive squares in 2 ways, for example, as 124300201 + 118461456 = 11149^2 + 10884^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-242761657 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (242761667) 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, 359844 + ... + 360517.

It is an arithmetic number, because the mean of its divisors is an integer number (60870589).

Almost surely, 2^242761657 is an apocalyptic number.

It is an amenable number.

242761657 is a deficient number, since it is larger than the sum of its proper divisors (720699).

242761657 is an equidigital number, since it uses as much as digits as its factorization.

242761657 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 720698.

The product of its digits is 141120, while the sum is 40.

The square root of 242761657 is about 15580.8105373244. The cubic root of 242761657 is about 623.8210581922.

The spelling of 242761657 in words is "two hundred forty-two million, seven hundred sixty-one thousand, six hundred fifty-seven".