261350245 has 8 divisors (see below), whose sum is σ = 337745016. Its totient is φ = 192997056.

The previous prime is 261350213. The next prime is 261350269. The reversal of 261350245 is 542053162.

It can be written as a sum of positive squares in 4 ways, for example, as 52085089 + 209265156 = 7217^2 + 14466^2 .

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 261350245 - 2⁵ = 261350213 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

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, 2010322 + ... + 2010451.

It is an arithmetic number, because the mean of its divisors is an integer number (42218127).

Almost surely, 2^261350245 is an apocalyptic number.

It is an amenable number.

261350245 is a deficient number, since it is larger than the sum of its proper divisors (76394771).

261350245 is a wasteful number, since it uses less digits than its factorization.

261350245 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4020791.

The product of its (nonzero) digits is 7200, while the sum is 28.

The square root of 261350245 is about 16166.3305978815. The cubic root of 261350245 is about 639.3533874539.

The spelling of 261350245 in words is "two hundred sixty-one million, three hundred fifty thousand, two hundred forty-five".