261356245 has 16 divisors (see below), whose sum is σ = 328084992. Its totient is φ = 199492480.

The previous prime is 261356219. The next prime is 261356287. The reversal of 261356245 is 542653162.

It is not a de Polignac number, because 261356245 - 2¹⁹ = 260831957 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 261356245.

It is a congruent number.

It is an unprimeable number.

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 15 ways as a sum of consecutive naturals, for example, 46929 + ... + 52201.

It is an arithmetic number, because the mean of its divisors is an integer number (20505312).

Almost surely, 2^261356245 is an apocalyptic number.

It is an amenable number.

261356245 is a deficient number, since it is larger than the sum of its proper divisors (66728747).

261356245 is a wasteful number, since it uses less digits than its factorization.

261356245 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5732.

The product of its digits is 43200, while the sum is 34.

The square root of 261356245 is about 16166.5161676844. The cubic root of 261356245 is about 639.3582801105.

The spelling of 261356245 in words is "two hundred sixty-one million, three hundred fifty-six thousand, two hundred forty-five".