261393146219 has 4 divisors (see below), whose sum is σ = 261394173144. Its totient is φ = 261392119296.

The previous prime is 261393146197. The next prime is 261393146221. The reversal of 261393146219 is 912641393162.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It is a cyclic number.

It is not a de Polignac number, because 261393146219 - 2⁸ = 261393145963 is a prime.

It is a super-2 number, since 2×261393146219² (a number of 24 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (261393140219) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 185579 + ... + 746475.

It is an arithmetic number, because the mean of its divisors is an integer number (65348543286).

Almost surely, 2^261393146219 is an apocalyptic number.

261393146219 is a deficient number, since it is larger than the sum of its proper divisors (1026925).

261393146219 is an equidigital number, since it uses as much as digits as its factorization.

261393146219 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1026924.

The product of its digits is 419904, while the sum is 47.

The spelling of 261393146219 in words is "two hundred sixty-one billion, three hundred ninety-three million, one hundred forty-six thousand, two hundred nineteen".