672371681 has 2 divisors, whose sum is σ = 672371682. Its totient is φ = 672371680.

The previous prime is 672371653. The next prime is 672371701. The reversal of 672371681 is 186173276.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 654899281 + 17472400 = 25591^2 + 4180^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-672371681 is a prime.

It is a super-2 number, since 2×672371681² = 904167354821531522, which contains 22 as substring.

It is a Chen prime.

It is equal to p_34894931 and since 672371681 and 34894931 have the same sum of digits, it is a Honaker prime.

It is not a weakly prime, because it can be changed into another prime (672371281) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 336185840 + 336185841.

It is an arithmetic number, because the mean of its divisors is an integer number (336185841).

Almost surely, 2^672371681 is an apocalyptic number.

It is an amenable number.

672371681 is a deficient number, since it is larger than the sum of its proper divisors (1).

672371681 is an equidigital number, since it uses as much as digits as its factorization.

672371681 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 84672, while the sum is 41.

The square root of 672371681 is about 25930.1307555515. The cubic root of 672371681 is about 876.0652847274.

The spelling of 672371681 in words is "six hundred seventy-two million, three hundred seventy-one thousand, six hundred eighty-one".