1671638231 has 2 divisors, whose sum is σ = 1671638232. Its totient is φ = 1671638230.

The previous prime is 1671638197. The next prime is 1671638233. The reversal of 1671638231 is 1328361761.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 1671638231 - 2¹⁰ = 1671637207 is a prime.

It is a super-2 number, since 2×1671638231² = 5588748750681618722, which contains 22 as substring.

Together with 1671638233, 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 (1671638233) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 835819115 + 835819116.

It is an arithmetic number, because the mean of its divisors is an integer number (835819116).

Almost surely, 2^1671638231 is an apocalyptic number.

1671638231 is a deficient number, since it is larger than the sum of its proper divisors (1).

1671638231 is an equidigital number, since it uses as much as digits as its factorization.

1671638231 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 36288, while the sum is 38.

The square root of 1671638231 is about 40885.6726861623. The cubic root of 1671638231 is about 1186.8088195109.

Adding to 1671638231 its reverse (1328361761), we get a palindrome (2999999992).

The spelling of 1671638231 in words is "one billion, six hundred seventy-one million, six hundred thirty-eight thousand, two hundred thirty-one".