690131 has 4 divisors (see below), whose sum is σ = 743232. Its totient is φ = 637032.

The previous prime is 690127. The next prime is 690139. The reversal of 690131 is 131096.

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 690131 - 2² = 690127 is a prime.

It is a super-2 number, since 2×690131² = 952561594322, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (690139) 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 3 ways as a sum of consecutive naturals, for example, 26531 + ... + 26556.

It is an arithmetic number, because the mean of its divisors is an integer number (185808).

2⁶⁹⁰¹³¹ is an apocalyptic number.

690131 is a deficient number, since it is larger than the sum of its proper divisors (53101).

690131 is a wasteful number, since it uses less digits than its factorization.

690131 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 53100.

The product of its (nonzero) digits is 162, while the sum is 20.

The square root of 690131 is about 830.7412352833. The cubic root of 690131 is about 88.3711510867.

The spelling of 690131 in words is "six hundred ninety thousand, one hundred thirty-one".