671470721 has 2 divisors, whose sum is σ = 671470722. Its totient is φ = 671470720.

The previous prime is 671470687. The next prime is 671470729. The reversal of 671470721 is 127074176.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 630010000 + 41460721 = 25100^2 + 6439^2 .

It is a cyclic number.

It is not a de Polignac number, because 671470721 - 2¹⁰ = 671469697 is a prime.

It is not a weakly prime, because it can be changed into another prime (671470729) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 335735360 + 335735361.

It is an arithmetic number, because the mean of its divisors is an integer number (335735361).

Almost surely, 2^671470721 is an apocalyptic number.

It is an amenable number.

671470721 is a deficient number, since it is larger than the sum of its proper divisors (1).

671470721 is an equidigital number, since it uses as much as digits as its factorization.

671470721 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 16464, while the sum is 35.

The square root of 671470721 is about 25912.7520923579. The cubic root of 671470721 is about 875.6738084994.

The spelling of 671470721 in words is "six hundred seventy-one million, four hundred seventy thousand, seven hundred twenty-one".