671420513 has 2 divisors, whose sum is σ = 671420514. Its totient is φ = 671420512.

The previous prime is 671420507. The next prime is 671420543. The reversal of 671420513 is 315024176.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 652904704 + 18515809 = 25552^2 + 4303^2 .

It is a cyclic number.

It is not a de Polignac number, because 671420513 - 2⁸ = 671420257 is a prime.

It is not a weakly prime, because it can be changed into another prime (671420543) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 335710256 + 335710257.

It is an arithmetic number, because the mean of its divisors is an integer number (335710257).

Almost surely, 2^671420513 is an apocalyptic number.

It is an amenable number.

671420513 is a deficient number, since it is larger than the sum of its proper divisors (1).

671420513 is an equidigital number, since it uses as much as digits as its factorization.

671420513 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 5040, while the sum is 29.

The square root of 671420513 is about 25911.7832848301. The cubic root of 671420513 is about 875.6519823174.

Adding to 671420513 its reverse (315024176), we get a palindrome (986444689).

The spelling of 671420513 in words is "six hundred seventy-one million, four hundred twenty thousand, five hundred thirteen".