242795257 has 2 divisors, whose sum is σ = 242795258. Its totient is φ = 242795256.

The previous prime is 242795251. The next prime is 242795297. The reversal of 242795257 is 752597242.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 215032896 + 27762361 = 14664^2 + 5269^2 .

It is a cyclic number.

It is not a de Polignac number, because 242795257 - 2¹⁹ = 242270969 is a prime.

It is not a weakly prime, because it can be changed into another prime (242795251) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 121397628 + 121397629.

It is an arithmetic number, because the mean of its divisors is an integer number (121397629).

Almost surely, 2^242795257 is an apocalyptic number.

It is an amenable number.

242795257 is a deficient number, since it is larger than the sum of its proper divisors (1).

242795257 is an equidigital number, since it uses as much as digits as its factorization.

242795257 is an evil number, because the sum of its binary digits is even.

The product of its digits is 352800, while the sum is 43.

The square root of 242795257 is about 15581.8887494424. Note that the first 3 decimals coincide. The cubic root of 242795257 is about 623.8498373397.

The spelling of 242795257 in words is "two hundred forty-two million, seven hundred ninety-five thousand, two hundred fifty-seven".