7216161 has 4 divisors (see below), whose sum is σ = 9621552. Its totient is φ = 4810772.

The previous prime is 7216159. The next prime is 7216163. The reversal of 7216161 is 1616127.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 1616127 = 3 ⋅538709.

It is an interprime number because it is at equal distance from previous prime (7216159) and next prime (7216163).

It is a cyclic number.

It is not a de Polignac number, because 7216161 - 2¹ = 7216159 is a prime.

It is an alternating number because its digits alternate between odd and even.

It is not an unprimeable number, because it can be changed into a prime (7216163) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1202691 + ... + 1202696.

It is an arithmetic number, because the mean of its divisors is an integer number (2405388).

Almost surely, 2^7216161 is an apocalyptic number.

It is an amenable number.

7216161 is a deficient number, since it is larger than the sum of its proper divisors (2405391).

7216161 is a wasteful number, since it uses less digits than its factorization.

7216161 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2405390.

The product of its digits is 504, while the sum is 24.

The square root of 7216161 is about 2686.2913095940. The cubic root of 7216161 is about 193.2422437193.

The spelling of 7216161 in words is "seven million, two hundred sixteen thousand, one hundred sixty-one".