691156 has 12 divisors (see below), whose sum is σ = 1219680. Its totient is φ = 342680.

The previous prime is 691153. The next prime is 691181. The reversal of 691156 is 651196.

691156 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (691151) 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, 136 + ... + 1183.

It is an arithmetic number, because the mean of its divisors is an integer number (101640).

2⁶⁹¹¹⁵⁶ is an apocalyptic number.

It is an amenable number.

691156 is a deficient number, since it is larger than the sum of its proper divisors (528524).

691156 is a wasteful number, since it uses less digits than its factorization.

691156 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1454 (or 1452 counting only the distinct ones).

The product of its digits is 1620, while the sum is 28.

The square root of 691156 is about 831.3579253246. The cubic root of 691156 is about 88.4148798004.

It can be divided in two parts, 69 and 1156, that added together give a triangular number (1225 = T₄₉).

The spelling of 691156 in words is "six hundred ninety-one thousand, one hundred fifty-six".