1165631 has 8 divisors (see below), whose sum is σ = 1267200. Its totient is φ = 1068120.

The previous prime is 1165583. The next prime is 1165643. The reversal of 1165631 is 1365611.

It is a happy number.

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

It is a cyclic number.

It is not a de Polignac number, because 1165631 - 2¹⁰ = 1164607 is a prime.

It is a super-2 number, since 2×1165631² = 2717391256322, which contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 1165597 and 1165606.

It is a congruent 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 7 ways as a sum of consecutive naturals, for example, 401 + ... + 1578.

It is an arithmetic number, because the mean of its divisors is an integer number (158400).

2^1165631 is an apocalyptic number.

1165631 is a deficient number, since it is larger than the sum of its proper divisors (101569).

1165631 is a wasteful number, since it uses less digits than its factorization.

1165631 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2029.

The product of its digits is 540, while the sum is 23.

The square root of 1165631 is about 1079.6439227820. The cubic root of 1165631 is about 105.2415000574.

The spelling of 1165631 in words is "one million, one hundred sixty-five thousand, six hundred thirty-one".