261509241829 has 8 divisors (see below), whose sum is σ = 290118111840. Its totient is φ = 233706255600.

The previous prime is 261509241803. The next prime is 261509241841. The reversal of 261509241829 is 928142905162.

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 261509241829 - 2¹⁹ = 261508717541 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 (261509241859) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 201470262 + ... + 201471559.

It is an arithmetic number, because the mean of its divisors is an integer number (36264763980).

Almost surely, 2^261509241829 is an apocalyptic number.

It is an amenable number.

261509241829 is a deficient number, since it is larger than the sum of its proper divisors (28608870011).

261509241829 is a wasteful number, since it uses less digits than its factorization.

261509241829 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 402941891.

The product of its (nonzero) digits is 622080, while the sum is 49.

The spelling of 261509241829 in words is "two hundred sixty-one billion, five hundred nine million, two hundred forty-one thousand, eight hundred twenty-nine".