11506861 has 2 divisors, whose sum is σ = 11506862. Its totient is φ = 11506860.

The previous prime is 11506849. The next prime is 11506897. The reversal of 11506861 is 16860511.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 10361961 + 1144900 = 3219^2 + 1070^2 .

It is an emirp because it is prime and its reverse (16860511) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 11506861 - 2¹⁵ = 11474093 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (11506811) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5753430 + 5753431.

It is an arithmetic number, because the mean of its divisors is an integer number (5753431).

Almost surely, 2^11506861 is an apocalyptic number.

It is an amenable number.

11506861 is a deficient number, since it is larger than the sum of its proper divisors (1).

11506861 is an equidigital number, since it uses as much as digits as its factorization.

11506861 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1440, while the sum is 28.

The square root of 11506861 is about 3392.1764399866. The cubic root of 11506861 is about 225.7627512647.

The spelling of 11506861 in words is "eleven million, five hundred six thousand, eight hundred sixty-one".