691012 has 48 divisors (see below), whose sum is σ = 1532160. Its totient is φ = 266112.

The previous prime is 691001. The next prime is 691037. The reversal of 691012 is 210196.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 18658 + ... + 18694.

It is an arithmetic number, because the mean of its divisors is an integer number (31920).

2⁶⁹¹⁰¹² is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 691012, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (766080).

691012 is an abundant number, since it is smaller than the sum of its proper divisors (841148).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

691012 is a wasteful number, since it uses less digits than its factorization.

691012 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 100 (or 98 counting only the distinct ones).

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

The square root of 691012 is about 831.2713155162. The cubic root of 691012 is about 88.4087390608.

It can be divided in two parts, 69 and 1012, that added together give a triangular number (1081 = T₄₆).

The spelling of 691012 in words is "six hundred ninety-one thousand, twelve".