672181 has 2 divisors, whose sum is σ = 672182. Its totient is φ = 672180.

The previous prime is 672169. The next prime is 672193. The reversal of 672181 is 181276.

It is a balanced prime because it is at equal distance from previous prime (672169) and next prime (672193).

It can be written as a sum of positive squares in only one way, i.e., 576081 + 96100 = 759^2 + 310^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-672181 is a prime.

It is a super-2 number, since 2×672181² = 903654593522, which contains 22 as substring.

It is an alternating number because its digits alternate between even and odd.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (672131) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 336090 + 336091.

It is an arithmetic number, because the mean of its divisors is an integer number (336091).

2⁶⁷²¹⁸¹ is an apocalyptic number.

It is an amenable number.

672181 is a deficient number, since it is larger than the sum of its proper divisors (1).

672181 is an equidigital number, since it uses as much as digits as its factorization.

672181 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 672, while the sum is 25.

The square root of 672181 is about 819.8664525397. The cubic root of 672181 is about 87.5982461093.

The spelling of 672181 in words is "six hundred seventy-two thousand, one hundred eighty-one".