673684261 has 2 divisors, whose sum is σ = 673684262. Its totient is φ = 673684260.

The previous prime is 673684217. The next prime is 673684289. The reversal of 673684261 is 162486376.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 412861761 + 260822500 = 20319^2 + 16150^2 .

It is a cyclic number.

It is not a de Polignac number, because 673684261 - 2¹⁵ = 673651493 is a prime.

It is a super-2 number, since 2×673684261² = 907700967038232242, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (673684861) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 336842130 + 336842131.

It is an arithmetic number, because the mean of its divisors is an integer number (336842131).

Almost surely, 2^673684261 is an apocalyptic number.

It is an amenable number.

673684261 is a deficient number, since it is larger than the sum of its proper divisors (1).

673684261 is an equidigital number, since it uses as much as digits as its factorization.

673684261 is an evil number, because the sum of its binary digits is even.

The product of its digits is 290304, while the sum is 43.

The square root of 673684261 is about 25955.4283532366. The cubic root of 673684261 is about 876.6349886308.

The spelling of 673684261 in words is "six hundred seventy-three million, six hundred eighty-four thousand, two hundred sixty-one".