672181589 has 2 divisors, whose sum is σ = 672181590. Its totient is φ = 672181588.

The previous prime is 672181583. The next prime is 672181607. The reversal of 672181589 is 985181276.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 658179025 + 14002564 = 25655^2 + 3742^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-672181589 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (672181583) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 336090794 + 336090795.

It is an arithmetic number, because the mean of its divisors is an integer number (336090795).

Almost surely, 2^672181589 is an apocalyptic number.

It is an amenable number.

672181589 is a deficient number, since it is larger than the sum of its proper divisors (1).

672181589 is an equidigital number, since it uses as much as digits as its factorization.

672181589 is an evil number, because the sum of its binary digits is even.

The product of its digits is 241920, while the sum is 47.

The square root of 672181589 is about 25926.4650309293. The cubic root of 672181589 is about 875.9827169536.

The spelling of 672181589 in words is "six hundred seventy-two million, one hundred eighty-one thousand, five hundred eighty-nine".