273538561 has 2 divisors, whose sum is σ = 273538562. Its totient is φ = 273538560.

The previous prime is 273538553. The next prime is 273538571. The reversal of 273538561 is 165835372.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 176890000 + 96648561 = 13300^2 + 9831^2 .

It is a cyclic number.

It is not a de Polignac number, because 273538561 - 2³ = 273538553 is a prime.

It is not a weakly prime, because it can be changed into another prime (273538571) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 136769280 + 136769281.

It is an arithmetic number, because the mean of its divisors is an integer number (136769281).

Almost surely, 2^273538561 is an apocalyptic number.

It is an amenable number.

273538561 is a deficient number, since it is larger than the sum of its proper divisors (1).

273538561 is an equidigital number, since it uses as much as digits as its factorization.

273538561 is an evil number, because the sum of its binary digits is even.

The product of its digits is 151200, while the sum is 40.

The square root of 273538561 is about 16539.0012092629. The cubic root of 273538561 is about 649.1417161044.

Subtracting from 273538561 its sum of digits (40), we obtain a square (273538521 = 16539²).

The spelling of 273538561 in words is "two hundred seventy-three million, five hundred thirty-eight thousand, five hundred sixty-one".