691042 has 16 divisors (see below), whose sum is σ = 1145664. Its totient is φ = 310000.

The previous prime is 691037. The next prime is 691051. The reversal of 691042 is 240196.

It is a Harshad number since it is a multiple of its sum of digits (22).

It is a nialpdrome in base 11.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2067 + ... + 2377.

It is an arithmetic number, because the mean of its divisors is an integer number (71604).

2⁶⁹¹⁰⁴² is an apocalyptic number.

691042 is a deficient number, since it is larger than the sum of its proper divisors (454622).

691042 is a wasteful number, since it uses less digits than its factorization.

691042 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 425.

The product of its (nonzero) digits is 432, while the sum is 22.

The square root of 691042 is about 831.2893599704. The cubic root of 691042 is about 88.4100184519.

It can be divided in two parts, 69 and 1042, that added together give a palindrome (1111).

The spelling of 691042 in words is "six hundred ninety-one thousand, forty-two".