11891399277 has 4 divisors (see below), whose sum is σ = 15855199040. Its totient is φ = 7927599516.

The previous prime is 11891399263. The next prime is 11891399291. The reversal of 11891399277 is 77299319811.

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 an interprime number because it is at equal distance from previous prime (11891399263) and next prime (11891399291).

It is not a de Polignac number, because 11891399277 - 2¹² = 11891395181 is a prime.

It is a super-2 number, since 2×11891399277² (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 (11891399297) 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, 1981899877 + ... + 1981899882.

It is an arithmetic number, because the mean of its divisors is an integer number (3963799760).

Almost surely, 2^11891399277 is an apocalyptic number.

It is an amenable number.

11891399277 is a deficient number, since it is larger than the sum of its proper divisors (3963799763).

11891399277 is an equidigital number, since it uses as much as digits as its factorization.

11891399277 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3963799762.

The product of its digits is 1714608, while the sum is 57.

The spelling of 11891399277 in words is "eleven billion, eight hundred ninety-one million, three hundred ninety-nine thousand, two hundred seventy-seven".