671542889 has 2 divisors, whose sum is σ = 671542890. Its totient is φ = 671542888.

The previous prime is 671542877. The next prime is 671542939. The reversal of 671542889 is 988245176.

It is an a-pointer prime, because the next prime (671542939) can be obtained adding 671542889 to its sum of digits (50).

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 516789289 + 154753600 = 22733^2 + 12440^2 .

It is a cyclic number.

It is not a de Polignac number, because 671542889 - 2²⁴ = 654765673 is a prime.

It is not a weakly prime, because it can be changed into another prime (671542829) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 335771444 + 335771445.

It is an arithmetic number, because the mean of its divisors is an integer number (335771445).

Almost surely, 2^671542889 is an apocalyptic number.

It is an amenable number.

671542889 is a deficient number, since it is larger than the sum of its proper divisors (1).

671542889 is an equidigital number, since it uses as much as digits as its factorization.

671542889 is an evil number, because the sum of its binary digits is even.

The product of its digits is 967680, while the sum is 50.

The square root of 671542889 is about 25914.1445739581. The cubic root of 671542889 is about 875.7051791219.

The spelling of 671542889 in words is "six hundred seventy-one million, five hundred forty-two thousand, eight hundred eighty-nine".