16121617 has 2 divisors, whose sum is σ = 16121618. Its totient is φ = 16121616.

The previous prime is 16121579. The next prime is 16121621. The reversal of 16121617 is 71612161.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 15713296 + 408321 = 3964^2 + 639^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-16121617 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 16121591 and 16121600.

It is not a weakly prime, because it can be changed into another prime (16121647) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 8060808 + 8060809.

It is an arithmetic number, because the mean of its divisors is an integer number (8060809).

Almost surely, 2^16121617 is an apocalyptic number.

It is an amenable number.

16121617 is a deficient number, since it is larger than the sum of its proper divisors (1).

16121617 is an equidigital number, since it uses as much as digits as its factorization.

16121617 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 16121617 is about 4015.1733461957. The cubic root of 16121617 is about 252.6210483877.

Adding to 16121617 its reverse (71612161), we get a palindrome (87733778).

The spelling of 16121617 in words is "sixteen million, one hundred twenty-one thousand, six hundred seventeen".