11191428877 has 2 divisors, whose sum is σ = 11191428878. Its totient is φ = 11191428876.

The previous prime is 11191428863. The next prime is 11191428881. The reversal of 11191428877 is 77882419111.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 11189196841 + 2232036 = 105779^2 + 1494^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-11191428877 is a prime.

It is a super-2 number, since 2×11191428877² (a number of 21 digits) contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 11191428877.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (11191428827) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5595714438 + 5595714439.

It is an arithmetic number, because the mean of its divisors is an integer number (5595714439).

Almost surely, 2^11191428877 is an apocalyptic number.

It is an amenable number.

11191428877 is a deficient number, since it is larger than the sum of its proper divisors (1).

11191428877 is an equidigital number, since it uses as much as digits as its factorization.

11191428877 is an evil number, because the sum of its binary digits is even.

The product of its digits is 225792, while the sum is 49.

The spelling of 11191428877 in words is "eleven billion, one hundred ninety-one million, four hundred twenty-eight thousand, eight hundred seventy-seven".