691073 has 4 divisors (see below), whose sum is σ = 694020. Its totient is φ = 688128.

The previous prime is 691063. The next prime is 691079. The reversal of 691073 is 370196.

It is a happy number.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 368449 + 322624 = 607^2 + 568^2 .

It is a cyclic number.

It is not a de Polignac number, because 691073 - 2⁸ = 690817 is a prime.

It is a Duffinian number.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 691073.

It is not an unprimeable number, because it can be changed into a prime (691079) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1088 + ... + 1601.

It is an arithmetic number, because the mean of its divisors is an integer number (173505).

2⁶⁹¹⁰⁷³ is an apocalyptic number.

It is an amenable number.

691073 is a deficient number, since it is larger than the sum of its proper divisors (2947).

691073 is a wasteful number, since it uses less digits than its factorization.

691073 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2946.

The product of its (nonzero) digits is 1134, while the sum is 26.

The square root of 691073 is about 831.3080054950. The cubic root of 691073 is about 88.4113404505.

The spelling of 691073 in words is "six hundred ninety-one thousand, seventy-three".