11555501 has 2 divisors, whose sum is σ = 11555502. Its totient is φ = 11555500.

The previous prime is 11555497. The next prime is 11555549. The reversal of 11555501 is 10555511.

It is a happy number.

11555501 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 9302500 + 2253001 = 3050^2 + 1501^2 .

It is a cyclic number.

It is not a de Polignac number, because 11555501 - 2² = 11555497 is a prime.

It is a super-2 number, since 2×11555501² = 267059206722002, which contains 22 as substring.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (11555701) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5777750 + 5777751.

It is an arithmetic number, because the mean of its divisors is an integer number (5777751).

Almost surely, 2^11555501 is an apocalyptic number.

It is an amenable number.

11555501 is a deficient number, since it is larger than the sum of its proper divisors (1).

11555501 is an equidigital number, since it uses as much as digits as its factorization.

11555501 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 625, while the sum is 23.

The square root of 11555501 is about 3399.3383179672. The cubic root of 11555501 is about 226.0804070797.

The spelling of 11555501 in words is "eleven million, five hundred fifty-five thousand, five hundred one".