16612649 has 2 divisors, whose sum is σ = 16612650. Its totient is φ = 16612648.

The previous prime is 16612643. The next prime is 16612681. The reversal of 16612649 is 94621661.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 14961424 + 1651225 = 3868^2 + 1285^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-16612649 is a prime.

It is a Sophie Germain prime.

It is a Curzon number.

It is not a weakly prime, because it can be changed into another prime (16612643) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 8306324 + 8306325.

It is an arithmetic number, because the mean of its divisors is an integer number (8306325).

Almost surely, 2^16612649 is an apocalyptic number.

It is an amenable number.

16612649 is a deficient number, since it is larger than the sum of its proper divisors (1).

16612649 is an equidigital number, since it uses as much as digits as its factorization.

16612649 is an evil number, because the sum of its binary digits is even.

The product of its digits is 15552, while the sum is 35.

The square root of 16612649 is about 4075.8617493728. The cubic root of 16612649 is about 255.1602171406.

The spelling of 16612649 in words is "sixteen million, six hundred twelve thousand, six hundred forty-nine".