1274240161 has 2 divisors, whose sum is σ = 1274240162. Its totient is φ = 1274240160.

The previous prime is 1274240159. The next prime is 1274240197. The reversal of 1274240161 is 1610424721.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 915365025 + 358875136 = 30255^2 + 18944^2 .

It is a cyclic number.

It is not a de Polignac number, because 1274240161 - 2¹ = 1274240159 is a prime.

Together with 1274240159, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (1274240131) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 637120080 + 637120081.

It is an arithmetic number, because the mean of its divisors is an integer number (637120081).

Almost surely, 2^1274240161 is an apocalyptic number.

It is an amenable number.

1274240161 is a deficient number, since it is larger than the sum of its proper divisors (1).

1274240161 is an equidigital number, since it uses as much as digits as its factorization.

1274240161 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 2688, while the sum is 28.

The square root of 1274240161 is about 35696.5006828400. The cubic root of 1274240161 is about 1084.1359926265.

Adding to 1274240161 its reverse (1610424721), we get a palindrome (2884664882).

The spelling of 1274240161 in words is "one billion, two hundred seventy-four million, two hundred forty thousand, one hundred sixty-one".