673211681 has 8 divisors (see below), whose sum is σ = 680099880. Its totient is φ = 666358272.

The previous prime is 673211663. The next prime is 673211683. The reversal of 673211681 is 186112376.

It can be written as a sum of positive squares in 4 ways, for example, as 273571600 + 399640081 = 16540^2 + 19991^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 673211681 - 2²⁶ = 606102817 is a prime.

It is a super-2 number, since 2×673211681² = 906427934869691522, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (673211683) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 31121 + ... + 48113.

It is an arithmetic number, because the mean of its divisors is an integer number (85012485).

Almost surely, 2^673211681 is an apocalyptic number.

It is an amenable number.

673211681 is a deficient number, since it is larger than the sum of its proper divisors (6888199).

673211681 is a wasteful number, since it uses less digits than its factorization.

673211681 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 17395.

The product of its digits is 12096, while the sum is 35.

The square root of 673211681 is about 25946.3230728364. The cubic root of 673211681 is about 876.4299583244.

The spelling of 673211681 in words is "six hundred seventy-three million, two hundred eleven thousand, six hundred eighty-one".