11879031261 has 4 divisors (see below), whose sum is σ = 15838708352. Its totient is φ = 7919354172.

The previous prime is 11879031259. The next prime is 11879031277. The reversal of 11879031261 is 16213097811.

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, and also an emirpimes, since its reverse is a distinct semiprime: 16213097811 = 3 ⋅5404365937.

It is not a de Polignac number, because 11879031261 - 2¹ = 11879031259 is a prime.

It is a super-2 number, since 2×11879031261² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (11879031251) 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, 1979838541 + ... + 1979838546.

It is an arithmetic number, because the mean of its divisors is an integer number (3959677088).

Almost surely, 2^11879031261 is an apocalyptic number.

It is an amenable number.

11879031261 is a deficient number, since it is larger than the sum of its proper divisors (3959677091).

11879031261 is an equidigital number, since it uses as much as digits as its factorization.

11879031261 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3959677090.

The product of its (nonzero) digits is 18144, while the sum is 39.

It can be divided in two parts, 118790 and 31261, that added together give a palindrome (150051).

The spelling of 11879031261 in words is "eleven billion, eight hundred seventy-nine million, thirty-one thousand, two hundred sixty-one".