261641035 has 8 divisors (see below), whose sum is σ = 318391776. Its totient is φ = 206364480.

The previous prime is 261640997. The next prime is 261641041. The reversal of 261641035 is 530146162.

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

It is not a de Polignac number, because 261641035 - 2¹⁹ = 261116747 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 261640994 and 261641012.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 368154 + ... + 368863.

It is an arithmetic number, because the mean of its divisors is an integer number (39798972).

Almost surely, 2^261641035 is an apocalyptic number.

261641035 is a deficient number, since it is larger than the sum of its proper divisors (56750741).

261641035 is an equidigital number, since it uses as much as digits as its factorization.

261641035 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 737093.

The product of its (nonzero) digits is 4320, while the sum is 28.

The square root of 261641035 is about 16175.3217896894. The cubic root of 261641035 is about 639.5904239778.

Adding to 261641035 its reverse (530146162), we get a palindrome (791787197).

The spelling of 261641035 in words is "two hundred sixty-one million, six hundred forty-one thousand, thirty-five".