671641237 has 2 divisors, whose sum is σ = 671641238. Its totient is φ = 671641236.

The previous prime is 671641231. The next prime is 671641249. The reversal of 671641237 is 732146176.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 462723121 + 208918116 = 21511^2 + 14454^2 .

It is a cyclic number.

It is not a de Polignac number, because 671641237 - 2⁷ = 671641109 is a prime.

It is a super-2 number, since 2×671641237² = 902203902477780338, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 671641196 and 671641205.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (671641231) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 335820618 + 335820619.

It is an arithmetic number, because the mean of its divisors is an integer number (335820619).

Almost surely, 2^671641237 is an apocalyptic number.

It is an amenable number.

671641237 is a deficient number, since it is larger than the sum of its proper divisors (1).

671641237 is an equidigital number, since it uses as much as digits as its factorization.

671641237 is an evil number, because the sum of its binary digits is even.

The product of its digits is 42336, while the sum is 37.

The square root of 671641237 is about 25916.0420782187. The cubic root of 671641237 is about 875.7479262794.

The spelling of 671641237 in words is "six hundred seventy-one million, six hundred forty-one thousand, two hundred thirty-seven".