673439491 has 2 divisors, whose sum is σ = 673439492. Its totient is φ = 673439490.

The previous prime is 673439483. The next prime is 673439509. The reversal of 673439491 is 194934376.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 673439491 - 2³ = 673439483 is a prime.

It is not a weakly prime, because it can be changed into another prime (673439791) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 336719745 + 336719746.

It is an arithmetic number, because the mean of its divisors is an integer number (336719746).

Almost surely, 2^673439491 is an apocalyptic number.

673439491 is a deficient number, since it is larger than the sum of its proper divisors (1).

673439491 is an equidigital number, since it uses as much as digits as its factorization.

673439491 is an evil number, because the sum of its binary digits is even.

The product of its digits is 489888, while the sum is 46.

The square root of 673439491 is about 25950.7127262432. The cubic root of 673439491 is about 876.5288063775.

It can be divided in two parts, 6734 and 39491, that added together give a square (46225 = 215²).

The spelling of 673439491 in words is "six hundred seventy-three million, four hundred thirty-nine thousand, four hundred ninety-one".