1165601 has 4 divisors (see below), whose sum is σ = 1192752. Its totient is φ = 1138452.

The previous prime is 1165583. The next prime is 1165643. The reversal of 1165601 is 1065611.

It is a happy number.

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: 1065611 = 17 ⋅62683.

It is a cyclic number.

It is not a de Polignac number, because 1165601 - 2¹⁸ = 903457 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1165691) 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, 13511 + ... + 13596.

It is an arithmetic number, because the mean of its divisors is an integer number (298188).

2^1165601 is an apocalyptic number.

It is an amenable number.

1165601 is a deficient number, since it is larger than the sum of its proper divisors (27151).

1165601 is an equidigital number, since it uses as much as digits as its factorization.

1165601 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 27150.

The product of its (nonzero) digits is 180, while the sum is 20.

The square root of 1165601 is about 1079.6300292230. The cubic root of 1165601 is about 105.2405971781.

The spelling of 1165601 in words is "one million, one hundred sixty-five thousand, six hundred one".