662131021 has 8 divisors (see below), whose sum is σ = 687040760. Its totient is φ = 637590528.

The previous prime is 662131003. The next prime is 662131033. The reversal of 662131021 is 120131266.

It can be written as a sum of positive squares in 4 ways, for example, as 37380996 + 624750025 = 6114^2 + 24995^2 .

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 662131021 - 2²⁵ = 628576589 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 662130983 and 662131001.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (662131081) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 88656 + ... + 95833.

It is an arithmetic number, because the mean of its divisors is an integer number (85880095).

Almost surely, 2^662131021 is an apocalyptic number.

It is an amenable number.

662131021 is a deficient number, since it is larger than the sum of its proper divisors (24909739).

662131021 is a wasteful number, since it uses less digits than its factorization.

662131021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 184623.

The product of its (nonzero) digits is 432, while the sum is 22.

The square root of 662131021 is about 25731.9066724563. The cubic root of 662131021 is about 871.5948291104.

Adding to 662131021 its reverse (120131266), we get a palindrome (782262287).

The spelling of 662131021 in words is "six hundred sixty-two million, one hundred thirty-one thousand, twenty-one".