690331 has 4 divisors (see below), whose sum is σ = 694000. Its totient is φ = 686664.

The previous prime is 690323. The next prime is 690341. The reversal of 690331 is 133096.

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

It is a cyclic number.

It is not a de Polignac number, because 690331 - 2³ = 690323 is a prime.

It is a super-2 number, since 2×690331² = 953113779122, which contains 22 as substring.

It is a Duffinian number.

It is a nialpdrome in base 15.

It is not an unprimeable number, because it can be changed into a prime (690341) 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, 1536 + ... + 1933.

It is an arithmetic number, because the mean of its divisors is an integer number (173500).

2⁶⁹⁰³³¹ is an apocalyptic number.

690331 is a deficient number, since it is larger than the sum of its proper divisors (3669).

690331 is a wasteful number, since it uses less digits than its factorization.

690331 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3668.

The product of its (nonzero) digits is 486, while the sum is 22.

The square root of 690331 is about 830.8616009902. The cubic root of 690331 is about 88.3796869170.

The spelling of 690331 in words is "six hundred ninety thousand, three hundred thirty-one".