7121161 has 2 divisors, whose sum is σ = 7121162. Its totient is φ = 7121160.

The previous prime is 7121141. The next prime is 7121173. The reversal of 7121161 is 1611217.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 5107600 + 2013561 = 2260^2 + 1419^2 .

It is an emirp because it is prime and its reverse (1611217) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 7121161 - 2⁷ = 7121033 is a prime.

It is not a weakly prime, because it can be changed into another prime (7121141) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3560580 + 3560581.

It is an arithmetic number, because the mean of its divisors is an integer number (3560581).

Almost surely, 2^7121161 is an apocalyptic number.

It is an amenable number.

7121161 is a deficient number, since it is larger than the sum of its proper divisors (1).

7121161 is an equidigital number, since it uses as much as digits as its factorization.

7121161 is an evil number, because the sum of its binary digits is even.

The product of its digits is 84, while the sum is 19.

The square root of 7121161 is about 2668.5503555301. The cubic root of 7121161 is about 192.3904903647.

Adding to 7121161 its reverse (1611217), we get a palindrome (8732378).

The spelling of 7121161 in words is "seven million, one hundred twenty-one thousand, one hundred sixty-one".