671836129 has 2 divisors, whose sum is σ = 671836130. Its totient is φ = 671836128.

The previous prime is 671836111. The next prime is 671836153. The reversal of 671836129 is 921638176.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 544755600 + 127080529 = 23340^2 + 11273^2 .

It is a cyclic number.

It is not a de Polignac number, because 671836129 - 2⁵ = 671836097 is a prime.

It is not a weakly prime, because it can be changed into another prime (671836159) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 335918064 + 335918065.

It is an arithmetic number, because the mean of its divisors is an integer number (335918065).

Almost surely, 2^671836129 is an apocalyptic number.

It is an amenable number.

671836129 is a deficient number, since it is larger than the sum of its proper divisors (1).

671836129 is an equidigital number, since it uses as much as digits as its factorization.

671836129 is an evil number, because the sum of its binary digits is even.

The product of its digits is 108864, while the sum is 43.

The square root of 671836129 is about 25919.8018703847. The cubic root of 671836129 is about 875.8326241556.

The spelling of 671836129 in words is "six hundred seventy-one million, eight hundred thirty-six thousand, one hundred twenty-nine".