261336573 has 6 divisors (see below), whose sum is σ = 377486174. Its totient is φ = 174224376.

The previous prime is 261336521. The next prime is 261336577. The reversal of 261336573 is 375633162.

261336573 is a `hidden beast` number, since 2 + 613 + 36 + 5 + 7 + 3 = 666.

It can be written as a sum of positive squares in only one way, i.e., 242518329 + 18818244 = 15573^2 + 4338^2 .

It is not a de Polignac number, because 261336573 - 2¹³ = 261328381 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 (261336577) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 14518690 + ... + 14518707.

Almost surely, 2^261336573 is an apocalyptic number.

It is an amenable number.

261336573 is a deficient number, since it is larger than the sum of its proper divisors (116149601).

261336573 is a wasteful number, since it uses less digits than its factorization.

261336573 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 29037403 (or 29037400 counting only the distinct ones).

The product of its digits is 68040, while the sum is 36.

The square root of 261336573 is about 16165.9077382002. The cubic root of 261336573 is about 639.3422384408.

The spelling of 261336573 in words is "two hundred sixty-one million, three hundred thirty-six thousand, five hundred seventy-three".