11900521 has 2 divisors, whose sum is σ = 11900522. Its totient is φ = 11900520.

The previous prime is 11900519. The next prime is 11900531. The reversal of 11900521 is 12500911.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 8785296 + 3115225 = 2964^2 + 1765^2 .

It is a cyclic number.

It is not a de Polignac number, because 11900521 - 2¹ = 11900519 is a prime.

Together with 11900519, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (11900501) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5950260 + 5950261.

It is an arithmetic number, because the mean of its divisors is an integer number (5950261).

Almost surely, 2^11900521 is an apocalyptic number.

It is an amenable number.

11900521 is a deficient number, since it is larger than the sum of its proper divisors (1).

11900521 is an equidigital number, since it uses as much as digits as its factorization.

11900521 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 90, while the sum is 19.

The square root of 11900521 is about 3449.7131764829. The cubic root of 11900521 is about 228.3084531945.

It can be divided in two parts, 11900 and 521, that added together give a palindrome (12421).

The spelling of 11900521 in words is "eleven million, nine hundred thousand, five hundred twenty-one".