11181901 has 2 divisors, whose sum is σ = 11181902. Its totient is φ = 11181900.

The previous prime is 11181883. The next prime is 11181923. The reversal of 11181901 is 10918111.

It is an a-pointer prime, because the next prime (11181923) can be obtained adding 11181901 to its sum of digits (22).

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 5635876 + 5546025 = 2374^2 + 2355^2 .

It is an emirp because it is prime and its reverse (10918111) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 11181901 - 2¹¹ = 11179853 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (11181931) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5590950 + 5590951.

It is an arithmetic number, because the mean of its divisors is an integer number (5590951).

Almost surely, 2^11181901 is an apocalyptic number.

It is an amenable number.

11181901 is a deficient number, since it is larger than the sum of its proper divisors (1).

11181901 is an equidigital number, since it uses as much as digits as its factorization.

11181901 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 72, while the sum is 22.

The square root of 11181901 is about 3343.9349575014. The cubic root of 11181901 is about 223.6172046823.

The spelling of 11181901 in words is "eleven million, one hundred eighty-one thousand, nine hundred one".