1020691 has 8 divisors (see below), whose sum is σ = 1193984. Its totient is φ = 854280.

The previous prime is 1020689. The next prime is 1020707. The reversal of 1020691 is 1960201.

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

It is not a de Polignac number, because 1020691 - 2¹ = 1020689 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1020631) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1395 + ... + 1996.

It is an arithmetic number, because the mean of its divisors is an integer number (149248).

2^1020691 is an apocalyptic number.

1020691 is a deficient number, since it is larger than the sum of its proper divisors (173293).

1020691 is an equidigital number, since it uses as much as digits as its factorization.

1020691 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3441.

The product of its (nonzero) digits is 108, while the sum is 19.

The square root of 1020691 is about 1010.2925318936. The cubic root of 1020691 is about 100.6849970762.

Adding to 1020691 its reverse (1960201), we get a palindrome (2980892).

It can be divided in two parts, 1020 and 691, that added together give a triangular number (1711 = T₅₈).

The spelling of 1020691 in words is "one million, twenty thousand, six hundred ninety-one".