11139400081 has 2 divisors, whose sum is σ = 11139400082. Its totient is φ = 11139400080.

The previous prime is 11139400049. The next prime is 11139400099. The reversal of 11139400081 is 18000493111.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 10303265025 + 836135056 = 101505^2 + 28916^2 .

It is a cyclic number.

It is not a de Polignac number, because 11139400081 - 2⁵ = 11139400049 is a prime.

It is a super-2 number, since 2×11139400081² (a number of 21 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (11139400681) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5569700040 + 5569700041.

It is an arithmetic number, because the mean of its divisors is an integer number (5569700041).

Almost surely, 2^11139400081 is an apocalyptic number.

It is an amenable number.

11139400081 is a deficient number, since it is larger than the sum of its proper divisors (1).

11139400081 is an equidigital number, since it uses as much as digits as its factorization.

11139400081 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 864, while the sum is 28.

Adding to 11139400081 its reverse (18000493111), we get a palindrome (29139893192).

The spelling of 11139400081 in words is "eleven billion, one hundred thirty-nine million, four hundred thousand, eighty-one".