242153657 has 2 divisors, whose sum is σ = 242153658. Its totient is φ = 242153656.

The previous prime is 242153623. The next prime is 242153663. The reversal of 242153657 is 756351242.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 239754256 + 2399401 = 15484^2 + 1549^2 .

It is a cyclic number.

It is not a de Polignac number, because 242153657 - 2¹⁰ = 242152633 is a prime.

It is not a weakly prime, because it can be changed into another prime (242153357) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 121076828 + 121076829.

It is an arithmetic number, because the mean of its divisors is an integer number (121076829).

Almost surely, 2^242153657 is an apocalyptic number.

It is an amenable number.

242153657 is a deficient number, since it is larger than the sum of its proper divisors (1).

242153657 is an equidigital number, since it uses as much as digits as its factorization.

242153657 is an evil number, because the sum of its binary digits is even.

The product of its digits is 50400, while the sum is 35.

The square root of 242153657 is about 15561.2871254276. The cubic root of 242153657 is about 623.2998332599.

It can be divided in two parts, 24215 and 3657, that added together give a palindrome (27872).

The spelling of 242153657 in words is "two hundred forty-two million, one hundred fifty-three thousand, six hundred fifty-seven".