1165691 has 2 divisors, whose sum is σ = 1165692. Its totient is φ = 1165690.

The previous prime is 1165667. The next prime is 1165711. The reversal of 1165691 is 1965611.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 1165691 - 2¹⁴ = 1149307 is a prime.

It is not a weakly prime, because it can be changed into another prime (1165991) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 582845 + 582846.

It is an arithmetic number, because the mean of its divisors is an integer number (582846).

2^1165691 is an apocalyptic number.

1165691 is a deficient number, since it is larger than the sum of its proper divisors (1).

1165691 is an equidigital number, since it uses as much as digits as its factorization.

1165691 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1620, while the sum is 29.

The square root of 1165691 is about 1079.6717093635. The cubic root of 1165691 is about 105.2433057694.

It can be divided in two parts, 11656 and 91, that multiplied together give a triangular number (1060696 = T₁₄₅₆).

The spelling of 1165691 in words is "one million, one hundred sixty-five thousand, six hundred ninety-one".