11623681 has 2 divisors, whose sum is σ = 11623682. Its totient is φ = 11623680.

The previous prime is 11623679. The next prime is 11623691. The reversal of 11623681 is 18632611.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 11451456 + 172225 = 3384^2 + 415^2 .

It is an emirp because it is prime and its reverse (18632611) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 11623681 - 2¹ = 11623679 is a prime.

It is a super-2 number, since 2×11623681² = 270219919979522, which contains 22 as substring.

Together with 11623679, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (11623621) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5811840 + 5811841.

It is an arithmetic number, because the mean of its divisors is an integer number (5811841).

Almost surely, 2^11623681 is an apocalyptic number.

It is an amenable number.

11623681 is a deficient number, since it is larger than the sum of its proper divisors (1).

11623681 is an equidigital number, since it uses as much as digits as its factorization.

11623681 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1728, while the sum is 28.

The square root of 11623681 is about 3409.3519912148. The cubic root of 11623681 is about 226.5241768331.

The spelling of 11623681 in words is "eleven million, six hundred twenty-three thousand, six hundred eighty-one".