1165021 has 8 divisors (see below), whose sum is σ = 1368864. Its totient is φ = 977520.

The previous prime is 1165001. The next prime is 1165037. The reversal of 1165021 is 1205611.

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 1165021 - 2¹⁹ = 640733 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 1164986 and 1165004.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1165001) 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, 3931 + ... + 4216.

It is an arithmetic number, because the mean of its divisors is an integer number (171108).

2^1165021 is an apocalyptic number.

1165021 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

1165021 is a deficient number, since it is larger than the sum of its proper divisors (203843).

1165021 is a wasteful number, since it uses less digits than its factorization.

1165021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8171.

The product of its (nonzero) digits is 60, while the sum is 16.

The square root of 1165021 is about 1079.3613852645. The cubic root of 1165021 is about 105.2231384670.

It can be divided in two parts, 11650 and 21, that multiplied together give a triangular number (244650 = T₆₉₉).

The spelling of 1165021 in words is "one million, one hundred sixty-five thousand, twenty-one".