1157161 has 4 divisors (see below), whose sum is σ = 1161172. Its totient is φ = 1153152.

The previous prime is 1157159. The next prime is 1157171. The reversal of 1157161 is 1617511.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 42025 + 1115136 = 205^2 + 1056^2 .

It is a cyclic number.

It is not a de Polignac number, because 1157161 - 2¹ = 1157159 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1157111) 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, 1536 + ... + 2161.

It is an arithmetic number, because the mean of its divisors is an integer number (290293).

2^1157161 is an apocalyptic number.

It is an amenable number.

1157161 is a deficient number, since it is larger than the sum of its proper divisors (4011).

1157161 is an equidigital number, since it uses as much as digits as its factorization.

1157161 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4010.

The product of its digits is 210, while the sum is 22.

The square root of 1157161 is about 1075.7141813698. The cubic root of 1157161 is about 104.9859694026.

The spelling of 1157161 in words is "one million, one hundred fifty-seven thousand, one hundred sixty-one".