670531513 has 4 divisors (see below), whose sum is σ = 670946788. Its totient is φ = 670116240.

The previous prime is 670531481. The next prime is 670531523. The reversal of 670531513 is 315135076.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 235683904 + 434847609 = 15352^2 + 20853^2 .

It is a cyclic number.

It is not a de Polignac number, because 670531513 - 2⁵ = 670531481 is a prime.

It is a super-3 number, since 3×670531513³ (a number of 27 digits) contains 333 as substring. Note that it is a super-d number also for d = 2.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (670531523) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 205206 + ... + 208447.

It is an arithmetic number, because the mean of its divisors is an integer number (167736697).

Almost surely, 2^670531513 is an apocalyptic number.

It is an amenable number.

670531513 is a deficient number, since it is larger than the sum of its proper divisors (415275).

670531513 is a wasteful number, since it uses less digits than its factorization.

670531513 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 415274.

The product of its (nonzero) digits is 9450, while the sum is 31.

The square root of 670531513 is about 25894.6232449905. The cubic root of 670531513 is about 875.2653401544.

Adding to 670531513 its reverse (315135076), we get a palindrome (985666589).

The spelling of 670531513 in words is "six hundred seventy million, five hundred thirty-one thousand, five hundred thirteen".