261490612241 has 4 divisors (see below), whose sum is σ = 261500608752. Its totient is φ = 261480615732.

The previous prime is 261490612193. The next prime is 261490612249. The reversal of 261490612241 is 142216094162.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 261490612241 - 2³⁴ = 244310743057 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 261490612195 and 261490612204.

It is not an unprimeable number, because it can be changed into a prime (261490612249) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 4958915 + ... + 5011368.

It is an arithmetic number, because the mean of its divisors is an integer number (65375152188).

Almost surely, 2^261490612241 is an apocalyptic number.

It is an amenable number.

261490612241 is a deficient number, since it is larger than the sum of its proper divisors (9996511).

261490612241 is an equidigital number, since it uses as much as digits as its factorization.

261490612241 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9996510.

The product of its (nonzero) digits is 41472, while the sum is 38.

The spelling of 261490612241 in words is "two hundred sixty-one billion, four hundred ninety million, six hundred twelve thousand, two hundred forty-one".