11637881 has 2 divisors, whose sum is σ = 11637882. Its totient is φ = 11637880.

The previous prime is 11637863. The next prime is 11637887. The reversal of 11637881 is 18873611.

11637881 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 7398400 + 4239481 = 2720^2 + 2059^2 .

It is an emirp because it is prime and its reverse (18873611) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 11637881 - 2⁶ = 11637817 is a prime.

It is a super-2 number, since 2×11637881² = 270880548340322, which contains 22 as substring.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (11637887) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5818940 + 5818941.

It is an arithmetic number, because the mean of its divisors is an integer number (5818941).

Almost surely, 2^11637881 is an apocalyptic number.

It is an amenable number.

11637881 is a deficient number, since it is larger than the sum of its proper divisors (1).

11637881 is an equidigital number, since it uses as much as digits as its factorization.

11637881 is an evil number, because the sum of its binary digits is even.

The product of its digits is 8064, while the sum is 35.

The square root of 11637881 is about 3411.4338627621. The cubic root of 11637881 is about 226.6163832616.

The spelling of 11637881 in words is "eleven million, six hundred thirty-seven thousand, eight hundred eighty-one".