11616721 has 2 divisors, whose sum is σ = 11616722. Its totient is φ = 11616720.

The previous prime is 11616701. The next prime is 11616749. The reversal of 11616721 is 12761611.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 9834496 + 1782225 = 3136^2 + 1335^2 .

It is a cyclic number.

It is not a de Polignac number, because 11616721 - 2¹³ = 11608529 is a prime.

It is not a weakly prime, because it can be changed into another prime (11616701) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5808360 + 5808361.

It is an arithmetic number, because the mean of its divisors is an integer number (5808361).

Almost surely, 2^11616721 is an apocalyptic number.

It is an amenable number.

11616721 is a deficient number, since it is larger than the sum of its proper divisors (1).

11616721 is an equidigital number, since it uses as much as digits as its factorization.

11616721 is an evil number, because the sum of its binary digits is even.

The product of its digits is 504, while the sum is 25.

The square root of 11616721 is about 3408.3311165437. The cubic root of 11616721 is about 226.4789552705.

The spelling of 11616721 in words is "eleven million, six hundred sixteen thousand, seven hundred twenty-one".