273964561 has 4 divisors (see below), whose sum is σ = 295038772. Its totient is φ = 252890352.

The previous prime is 273964519. The next prime is 273964573. The reversal of 273964561 is 165469372.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 75690000 + 198274561 = 8700^2 + 14081^2 .

It is not a de Polignac number, because 273964561 - 2⁷ = 273964433 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (273964511) 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 in 3 ways as a sum of consecutive naturals, for example, 10537086 + ... + 10537111.

It is an arithmetic number, because the mean of its divisors is an integer number (73759693).

Almost surely, 2^273964561 is an apocalyptic number.

It is an amenable number.

273964561 is a deficient number, since it is larger than the sum of its proper divisors (21074211).

273964561 is a wasteful number, since it uses less digits than its factorization.

273964561 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 21074210.

The product of its digits is 272160, while the sum is 43.

The square root of 273964561 is about 16551.8748484877. The cubic root of 273964561 is about 649.4785253388.

The spelling of 273964561 in words is "two hundred seventy-three million, nine hundred sixty-four thousand, five hundred sixty-one".