671515513 has 2 divisors, whose sum is σ = 671515514. Its totient is φ = 671515512.

The previous prime is 671515469. The next prime is 671515531. The reversal of 671515513 is 315515176.

Together with next prime (671515531) it forms an Ormiston pair, because they use the same digits, order apart.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 634888809 + 36626704 = 25197^2 + 6052^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-671515513 is a prime.

It is equal to p_34852930 and since 671515513 and 34852930 have the same sum of digits, it is a Honaker prime.

It is not a weakly prime, because it can be changed into another prime (671515543) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 335757756 + 335757757.

It is an arithmetic number, because the mean of its divisors is an integer number (335757757).

Almost surely, 2^671515513 is an apocalyptic number.

It is an amenable number.

671515513 is a deficient number, since it is larger than the sum of its proper divisors (1).

671515513 is an equidigital number, since it uses as much as digits as its factorization.

671515513 is an evil number, because the sum of its binary digits is even.

The product of its digits is 15750, while the sum is 34.

The square root of 671515513 is about 25913.6163628313. The cubic root of 671515513 is about 875.6932793455.

The spelling of 671515513 in words is "six hundred seventy-one million, five hundred fifteen thousand, five hundred thirteen".