660431201 has 4 divisors (see below), whose sum is σ = 671258004. Its totient is φ = 649604400.

The previous prime is 660431183. The next prime is 660431221. The reversal of 660431201 is 102134066.

It is a happy number.

660431201 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 102134066 = 2 ⋅51067033.

It can be written as a sum of positive squares in 2 ways, for example, as 38427601 + 622003600 = 6199^2 + 24940^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-660431201 is a prime.

It is a super-3 number, since 3×660431201³ (a number of 27 digits) contains 333 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (660431221) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 5413310 + ... + 5413431.

It is an arithmetic number, because the mean of its divisors is an integer number (167814501).

Almost surely, 2^660431201 is an apocalyptic number.

660431201 is a gapful number since it is divisible by the number (61) formed by its first and last digit.

It is an amenable number.

660431201 is a deficient number, since it is larger than the sum of its proper divisors (10826803).

660431201 is a wasteful number, since it uses less digits than its factorization.

660431201 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10826802.

The product of its (nonzero) digits is 864, while the sum is 23.

The square root of 660431201 is about 25698.8560251230. The cubic root of 660431201 is about 870.8483384109.

Adding to 660431201 its reverse (102134066), we get a palindrome (762565267).

The spelling of 660431201 in words is "six hundred sixty million, four hundred thirty-one thousand, two hundred one".