274138561 has 2 divisors, whose sum is σ = 274138562. Its totient is φ = 274138560.

The previous prime is 274138547. The next prime is 274138577. The reversal of 274138561 is 165831472.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 237160000 + 36978561 = 15400^2 + 6081^2 .

It is a cyclic number.

It is not a de Polignac number, because 274138561 - 2¹⁹ = 273614273 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 274138561.

It is not a weakly prime, because it can be changed into another prime (274138531) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 137069280 + 137069281.

It is an arithmetic number, because the mean of its divisors is an integer number (137069281).

Almost surely, 2^274138561 is an apocalyptic number.

It is an amenable number.

274138561 is a deficient number, since it is larger than the sum of its proper divisors (1).

274138561 is an equidigital number, since it uses as much as digits as its factorization.

274138561 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 40320, while the sum is 37.

The square root of 274138561 is about 16557.1302163147. The cubic root of 274138561 is about 649.6159948795.

The spelling of 274138561 in words is "two hundred seventy-four million, one hundred thirty-eight thousand, five hundred sixty-one".