261479013119 has 4 divisors (see below), whose sum is σ = 262718250360. Its totient is φ = 260239775880.

The previous prime is 261479013101. The next prime is 261479013149. The reversal of 261479013119 is 911310974162.

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 911310974162 = 2 ⋅455655487081.

It is a cyclic number.

It is not a de Polignac number, because 261479013119 - 2⁸ = 261479012863 is a prime.

It is a super-4 number, since 4×261479013119⁴ (a number of 47 digits) contains 4444 as substring. Note that it is a super-d number also for d = 2.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 261479013119.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (261479013149) 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, 619618304 + ... + 619618725.

It is an arithmetic number, because the mean of its divisors is an integer number (65679562590).

Almost surely, 2^261479013119 is an apocalyptic number.

261479013119 is a deficient number, since it is larger than the sum of its proper divisors (1239237241).

261479013119 is a wasteful number, since it uses less digits than its factorization.

261479013119 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1239237240.

The product of its (nonzero) digits is 81648, while the sum is 44.

The spelling of 261479013119 in words is "two hundred sixty-one billion, four hundred seventy-nine million, thirteen thousand, one hundred nineteen".