1161597 has 4 divisors (see below), whose sum is σ = 1548800. Its totient is φ = 774396.

The previous prime is 1161581. The next prime is 1161599. The reversal of 1161597 is 7951611.

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: 7951611 = 3 ⋅2650537.

It is not a de Polignac number, because 1161597 - 2⁴ = 1161581 is a prime.

It is a D-number.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1161599) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 193597 + ... + 193602.

It is an arithmetic number, because the mean of its divisors is an integer number (387200).

2^1161597 is an apocalyptic number.

It is an amenable number.

1161597 is a deficient number, since it is larger than the sum of its proper divisors (387203).

1161597 is an equidigital number, since it uses as much as digits as its factorization.

1161597 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 387202.

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

The square root of 1161597 is about 1077.7740950682. The cubic root of 1161597 is about 105.1199536139.

The spelling of 1161597 in words is "one million, one hundred sixty-one thousand, five hundred ninety-seven".