660242131 has 4 divisors (see below), whose sum is σ = 660923064. Its totient is φ = 659561200.

The previous prime is 660242119. The next prime is 660242137. The reversal of 660242131 is 131242066.

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 660242131 - 2¹¹ = 660240083 is a prime.

It is a super-2 number, since 2×660242131² = 871839343094842322, which contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 660242096 and 660242105.

It is not an unprimeable number, because it can be changed into a prime (660242137) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 339010 + ... + 340951.

It is an arithmetic number, because the mean of its divisors is an integer number (165230766).

Almost surely, 2^660242131 is an apocalyptic number.

660242131 is a deficient number, since it is larger than the sum of its proper divisors (680933).

660242131 is an equidigital number, since it uses as much as digits as its factorization.

660242131 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 680932.

The product of its (nonzero) digits is 1728, while the sum is 25.

The square root of 660242131 is about 25695.1771933957. The cubic root of 660242131 is about 870.7652275535.

Adding to 660242131 its reverse (131242066), we get a palindrome (791484197).

The spelling of 660242131 in words is "six hundred sixty million, two hundred forty-two thousand, one hundred thirty-one".