261306733 has 8 divisors (see below), whose sum is σ = 272846880. Its totient is φ = 249935280.

The previous prime is 261306713. The next prime is 261306739. The reversal of 261306733 is 337603162.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 261306733 - 2¹⁷ = 261175661 is a prime.

It is a super-2 number, since 2×261306733² = 136562417422266578, which contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 261306695 and 261306704.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (261306739) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 39003 + ... + 45208.

It is an arithmetic number, because the mean of its divisors is an integer number (34105860).

Almost surely, 2^261306733 is an apocalyptic number.

It is an amenable number.

261306733 is a deficient number, since it is larger than the sum of its proper divisors (11540147).

261306733 is a wasteful number, since it uses less digits than its factorization.

261306733 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 84347.

The product of its (nonzero) digits is 13608, while the sum is 31.

The square root of 261306733 is about 16164.9847819291. The cubic root of 261306733 is about 639.3179036678.

Adding to 261306733 its reverse (337603162), we get a palindrome (598909895).

The spelling of 261306733 in words is "two hundred sixty-one million, three hundred six thousand, seven hundred thirty-three".