1671261589 has 2 divisors, whose sum is σ = 1671261590. Its totient is φ = 1671261588.

The previous prime is 1671261587. The next prime is 1671261637. The reversal of 1671261589 is 9851621761.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1323140625 + 348120964 = 36375^2 + 18658^2 .

It is an emirp because it is prime and its reverse (9851621761) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 1671261589 - 2¹ = 1671261587 is a prime.

Together with 1671261587, it forms a pair of twin primes.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1671261587) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 835630794 + 835630795.

It is an arithmetic number, because the mean of its divisors is an integer number (835630795).

Almost surely, 2^1671261589 is an apocalyptic number.

It is an amenable number.

1671261589 is a deficient number, since it is larger than the sum of its proper divisors (1).

1671261589 is an equidigital number, since it uses as much as digits as its factorization.

1671261589 is an evil number, because the sum of its binary digits is even.

The product of its digits is 181440, while the sum is 46.

The square root of 1671261589 is about 40881.0663877546. The cubic root of 1671261589 is about 1186.7196782890.

The spelling of 1671261589 in words is "one billion, six hundred seventy-one million, two hundred sixty-one thousand, five hundred eighty-nine".