242990257 has 6 divisors (see below), whose sum is σ = 244633074. Its totient is φ = 241358400.

The previous prime is 242990249. The next prime is 242990273. The reversal of 242990257 is 752099242.

It can be written as a sum of positive squares in only one way, i.e., 149597361 + 93392896 = 12231^2 + 9664^2 .

It is not a de Polignac number, because 242990257 - 2³ = 242990249 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (242990357) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 17473 + ... + 28129.

It is an arithmetic number, because the mean of its divisors is an integer number (40772179).

Almost surely, 2^242990257 is an apocalyptic number.

It is an amenable number.

242990257 is a deficient number, since it is larger than the sum of its proper divisors (1642817).

242990257 is an equidigital number, since it uses as much as digits as its factorization.

242990257 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10959 (or 10808 counting only the distinct ones).

The product of its (nonzero) digits is 90720, while the sum is 40.

The square root of 242990257 is about 15588.1447581167. The cubic root of 242990257 is about 624.0168067808.

The spelling of 242990257 in words is "two hundred forty-two million, nine hundred ninety thousand, two hundred fifty-seven".