690931 has 8 divisors (see below), whose sum is σ = 740880. Its totient is φ = 642048.

The previous prime is 690929. The next prime is 690953. The reversal of 690931 is 139096.

It is a happy number.

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

It is a cyclic number.

It is not a de Polignac number, because 690931 - 2¹ = 690929 is a prime.

It is a super-2 number, since 2×690931² = 954771293522, which contains 22 as substring.

It is a Duffinian number.

690931 is a lucky number.

It is a self number, because there is not a number n which added to its sum of digits gives 690931.

It is not an unprimeable number, because it can be changed into a prime (691931) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1440 + ... + 1858.

It is an arithmetic number, because the mean of its divisors is an integer number (92610).

2⁶⁹⁰⁹³¹ is an apocalyptic number.

690931 is a deficient number, since it is larger than the sum of its proper divisors (49949).

690931 is a wasteful number, since it uses less digits than its factorization.

690931 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 533.

The product of its (nonzero) digits is 1458, while the sum is 28.

The square root of 690931 is about 831.2225935332. Note that the first 3 decimals coincide. The cubic root of 690931 is about 88.4052845199.

The spelling of 690931 in words is "six hundred ninety thousand, nine hundred thirty-one".