671609501 has 2 divisors, whose sum is σ = 671609502. Its totient is φ = 671609500.

The previous prime is 671609443. The next prime is 671609503. The reversal of 671609501 is 105906176.

671609501 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 616330276 + 55279225 = 24826^2 + 7435^2 .

It is a cyclic number.

It is not a de Polignac number, because 671609501 - 2⁶ = 671609437 is a prime.

Together with 671609503, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (671609503) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 335804750 + 335804751.

It is an arithmetic number, because the mean of its divisors is an integer number (335804751).

Almost surely, 2^671609501 is an apocalyptic number.

It is an amenable number.

671609501 is a deficient number, since it is larger than the sum of its proper divisors (1).

671609501 is an equidigital number, since it uses as much as digits as its factorization.

671609501 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 11340, while the sum is 35.

The square root of 671609501 is about 25915.4297861332. The cubic root of 671609501 is about 875.7341326188.

The spelling of 671609501 in words is "six hundred seventy-one million, six hundred nine thousand, five hundred one".