261020573 has 4 divisors (see below), whose sum is σ = 284749728. Its totient is φ = 237291420.

The previous prime is 261020569. The next prime is 261020581. The reversal of 261020573 is 375020162.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 261020573 - 2² = 261020569 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (261320573) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 11864561 + ... + 11864582.

It is an arithmetic number, because the mean of its divisors is an integer number (71187432).

Almost surely, 2^261020573 is an apocalyptic number.

It is an amenable number.

261020573 is a deficient number, since it is larger than the sum of its proper divisors (23729155).

261020573 is a wasteful number, since it uses less digits than its factorization.

261020573 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 23729154.

The product of its (nonzero) digits is 2520, while the sum is 26.

The square root of 261020573 is about 16156.1311272223. The cubic root of 261020573 is about 639.0844436361.

The spelling of 261020573 in words is "two hundred sixty-one million, twenty thousand, five hundred seventy-three".