690531 has 8 divisors (see below), whose sum is σ = 945744. Its totient is φ = 447840.

The previous prime is 690511. The next prime is 690533. The reversal of 690531 is 135096.

690531 is digitally balanced in base 7, because in such base it contains all the possibile digits an equal number of times.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 690531 - 2⁶ = 690467 is a prime.

It is a super-3 number, since 3×690531³ = 987804033326973873, which contains 333 as substring. Note that it is a super-d number also for d = 2.

It is a Smith number, since the sum of its digits (24) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

690531 is strictly pandigital in base 7.

It is not an unprimeable number, because it can be changed into a prime (690533) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 3000 + ... + 3221.

It is an arithmetic number, because the mean of its divisors is an integer number (118218).

2⁶⁹⁰⁵³¹ is an apocalyptic number.

690531 is a deficient number, since it is larger than the sum of its proper divisors (255213).

690531 is a wasteful number, since it uses less digits than its factorization.

690531 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6261.

The product of its (nonzero) digits is 810, while the sum is 24.

The square root of 690531 is about 830.9819492624. The cubic root of 690531 is about 88.3882210987.

It can be divided in two parts, 690 and 531, that added together give a palindrome (1221).

The spelling of 690531 in words is "six hundred ninety thousand, five hundred thirty-one".