11909621 has 2 divisors, whose sum is σ = 11909622. Its totient is φ = 11909620.

The previous prime is 11909591. The next prime is 11909647. The reversal of 11909621 is 12690911.

11909621 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 9394225 + 2515396 = 3065^2 + 1586^2 .

It is a cyclic number.

It is not a de Polignac number, because 11909621 - 2¹⁰ = 11908597 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (11909221) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5954810 + 5954811.

It is an arithmetic number, because the mean of its divisors is an integer number (5954811).

Almost surely, 2^11909621 is an apocalyptic number.

It is an amenable number.

11909621 is a deficient number, since it is larger than the sum of its proper divisors (1).

11909621 is an equidigital number, since it uses as much as digits as its factorization.

11909621 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 972, while the sum is 29.

The square root of 11909621 is about 3451.0318746717. The cubic root of 11909621 is about 228.3666320923.

The spelling of 11909621 in words is "eleven million, nine hundred nine thousand, six hundred twenty-one".