1155691 has 4 divisors (see below), whose sum is σ = 1170400. Its totient is φ = 1140984.

The previous prime is 1155689. The next prime is 1155697. The reversal of 1155691 is 1965511.

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

It is a cyclic number.

It is not a de Polignac number, because 1155691 - 2¹ = 1155689 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1155697) 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, 7236 + ... + 7393.

It is an arithmetic number, because the mean of its divisors is an integer number (292600).

2^1155691 is an apocalyptic number.

1155691 is a deficient number, since it is larger than the sum of its proper divisors (14709).

1155691 is an equidigital number, since it uses as much as digits as its factorization.

1155691 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 14708.

The product of its digits is 1350, while the sum is 28.

The square root of 1155691 is about 1075.0306972361. The cubic root of 1155691 is about 104.9414942397.

The spelling of 1155691 in words is "one million, one hundred fifty-five thousand, six hundred ninety-one".