690831 has 12 divisors (see below), whose sum is σ = 1015560. Its totient is φ = 452400.

The previous prime is 690817. The next prime is 690839. The reversal of 690831 is 138096.

690831 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 690831 - 2¹⁰ = 689807 is a prime.

It is a super-2 number, since 2×690831² = 954494941122, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 690795 and 690804.

It is a congruent number.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 690831.

It is not an unprimeable number, because it can be changed into a prime (690839) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 120 + ... + 1181.

It is an arithmetic number, because the mean of its divisors is an integer number (84630).

2⁶⁹⁰⁸³¹ is an apocalyptic number.

690831 is a deficient number, since it is larger than the sum of its proper divisors (324729).

690831 is a wasteful number, since it uses less digits than its factorization.

690831 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1366 (or 1363 counting only the distinct ones).

The product of its (nonzero) digits is 1296, while the sum is 27.

The square root of 690831 is about 831.1624389973. The cubic root of 690831 is about 88.4010192821.

It can be divided in two parts, 690 and 831, that added together give a square (1521 = 39²).

The spelling of 690831 in words is "six hundred ninety thousand, eight hundred thirty-one".