671826121 has 2 divisors, whose sum is σ = 671826122. Its totient is φ = 671826120.

The previous prime is 671826083. The next prime is 671826139. The reversal of 671826121 is 121628176.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 537729721 + 134096400 = 23189^2 + 11580^2 .

It is a cyclic number.

It is not a de Polignac number, because 671826121 - 2⁷ = 671825993 is a prime.

It is not a weakly prime, because it can be changed into another prime (671826521) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 335913060 + 335913061.

It is an arithmetic number, because the mean of its divisors is an integer number (335913061).

Almost surely, 2^671826121 is an apocalyptic number.

It is an amenable number.

671826121 is a deficient number, since it is larger than the sum of its proper divisors (1).

671826121 is an equidigital number, since it uses as much as digits as its factorization.

671826121 is an evil number, because the sum of its binary digits is even.

The product of its digits is 8064, while the sum is 34.

The square root of 671826121 is about 25919.6088126345. The cubic root of 671826121 is about 875.8282751901.

The spelling of 671826121 in words is "six hundred seventy-one million, eight hundred twenty-six thousand, one hundred twenty-one".