7125161 has 4 divisors (see below), whose sum is σ = 7259652. Its totient is φ = 6990672.

The previous prime is 7125121. The next prime is 7125169. The reversal of 7125161 is 1615217.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 1615217 = 193 ⋅8369.

It can be written as a sum of positive squares in 2 ways, for example, as 5040025 + 2085136 = 2245^2 + 1444^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-7125161 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (7125169) 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, 67166 + ... + 67271.

It is an arithmetic number, because the mean of its divisors is an integer number (1814913).

Almost surely, 2^7125161 is an apocalyptic number.

It is an amenable number.

7125161 is a deficient number, since it is larger than the sum of its proper divisors (134491).

7125161 is a wasteful number, since it uses less digits than its factorization.

7125161 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 134490.

The product of its digits is 420, while the sum is 23.

The square root of 7125161 is about 2669.2997209006. The cubic root of 7125161 is about 192.4265059300.

The spelling of 7125161 in words is "seven million, one hundred twenty-five thousand, one hundred sixty-one".