669131 has 4 divisors (see below), whose sum is σ = 672792. Its totient is φ = 665472.

The previous prime is 669127. The next prime is 669133. The reversal of 669131 is 131966.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 131966 = 2 ⋅65983.

It is a cyclic number.

It is not a de Polignac number, because 669131 - 2² = 669127 is a prime.

It is a super-2 number, since 2×669131² = 895472590322, which contains 22 as substring.

It is an Ulam number.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 669131.

It is not an unprimeable number, because it can be changed into a prime (669133) 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, 1541 + ... + 1926.

It is an arithmetic number, because the mean of its divisors is an integer number (168198).

2⁶⁶⁹¹³¹ is an apocalyptic number.

669131 is a deficient number, since it is larger than the sum of its proper divisors (3661).

669131 is a wasteful number, since it uses less digits than its factorization.

669131 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3660.

The product of its digits is 972, while the sum is 26.

The square root of 669131 is about 818.0042787174. The cubic root of 669131 is about 87.4655537882.

The spelling of 669131 in words is "six hundred sixty-nine thousand, one hundred thirty-one".