1165971 has 4 divisors (see below), whose sum is σ = 1554632. Its totient is φ = 777312.

The previous prime is 1165951. The next prime is 1165991. The reversal of 1165971 is 1795611.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 1795611 = 3 ⋅598537.

It is an interprime number because it is at equal distance from previous prime (1165951) and next prime (1165991).

It is not a de Polignac number, because 1165971 - 2¹¹ = 1163923 is a prime.

It is a D-number.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1165921) 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, 194326 + ... + 194331.

It is an arithmetic number, because the mean of its divisors is an integer number (388658).

2^1165971 is an apocalyptic number.

1165971 is a deficient number, since it is larger than the sum of its proper divisors (388661).

1165971 is an equidigital number, since it uses as much as digits as its factorization.

1165971 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 388660.

The product of its digits is 1890, while the sum is 30.

The square root of 1165971 is about 1079.8013706233. The cubic root of 1165971 is about 105.2517316062.

The spelling of 1165971 in words is "one million, one hundred sixty-five thousand, nine hundred seventy-one".