11721547 has 2 divisors, whose sum is σ = 11721548. Its totient is φ = 11721546.

The previous prime is 11721527. The next prime is 11721571. The reversal of 11721547 is 74512711.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 11721547 - 2⁷ = 11721419 is a prime.

It is not a weakly prime, because it can be changed into another prime (11721527) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5860773 + 5860774.

It is an arithmetic number, because the mean of its divisors is an integer number (5860774).

Almost surely, 2^11721547 is an apocalyptic number.

11721547 is a deficient number, since it is larger than the sum of its proper divisors (1).

11721547 is an equidigital number, since it uses as much as digits as its factorization.

11721547 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1960, while the sum is 28.

The square root of 11721547 is about 3423.6744880318. The cubic root of 11721547 is about 227.1581437289.

The spelling of 11721547 in words is "eleven million, seven hundred twenty-one thousand, five hundred forty-seven".