16217161 has 2 divisors, whose sum is σ = 16217162. Its totient is φ = 16217160.

The previous prime is 16217147. The next prime is 16217171. The reversal of 16217161 is 16171261.

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., 13461561 + 2755600 = 3669^2 + 1660^2 .

It is a cyclic number.

It is not a de Polignac number, because 16217161 - 2¹⁷ = 16086089 is a prime.

It is a plaindrome in base 9.

It is not a weakly prime, because it can be changed into another prime (16217141) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 8108580 + 8108581.

It is an arithmetic number, because the mean of its divisors is an integer number (8108581).

Almost surely, 2^16217161 is an apocalyptic number.

It is an amenable number.

16217161 is a deficient number, since it is larger than the sum of its proper divisors (1).

16217161 is an equidigital number, since it uses as much as digits as its factorization.

16217161 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 16217161 is about 4027.0536375867. The cubic root of 16217161 is about 253.1191146526.

The spelling of 16217161 in words is "sixteen million, two hundred seventeen thousand, one hundred sixty-one".