1165511001 has 8 divisors (see below), whose sum is σ = 1590154720. Its totient is φ = 758937312.

The previous prime is 1165510991. The next prime is 1165511003. The reversal of 1165511001 is 1001155611.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 1165511001 - 2¹⁰ = 1165509977 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1165511003) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 4517356 + ... + 4517613.

It is an arithmetic number, because the mean of its divisors is an integer number (198769340).

Almost surely, 2^1165511001 is an apocalyptic number.

It is an amenable number.

1165511001 is a deficient number, since it is larger than the sum of its proper divisors (424643719).

1165511001 is an equidigital number, since it uses as much as digits as its factorization.

1165511001 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9035015.

The product of its (nonzero) digits is 150, while the sum is 21.

The square root of 1165511001 is about 34139.5811485730. The cubic root of 1165511001 is about 1052.3788847756.

Adding to 1165511001 its reverse (1001155611), we get a palindrome (2166666612).

The spelling of 1165511001 in words is "one billion, one hundred sixty-five million, five hundred eleven thousand, one".