67181641 has 4 divisors (see below), whose sum is σ = 67424452. Its totient is φ = 66938832.

The previous prime is 67181627. The next prime is 67181669. The reversal of 67181641 is 14618176.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 12110400 + 55071241 = 3480^2 + 7421^2 .

It is a cyclic number.

It is not a de Polignac number, because 67181641 - 2⁹ = 67181129 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 67181597 and 67181606.

It is not an unprimeable number, because it can be changed into a prime (67181041) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 120990 + ... + 121543.

It is an arithmetic number, because the mean of its divisors is an integer number (16856113).

Almost surely, 2^67181641 is an apocalyptic number.

It is an amenable number.

67181641 is a deficient number, since it is larger than the sum of its proper divisors (242811).

67181641 is a wasteful number, since it uses less digits than its factorization.

67181641 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 242810.

The product of its digits is 8064, while the sum is 34.

The square root of 67181641 is about 8196.4407519362. The cubic root of 67181641 is about 406.5215155032.

The spelling of 67181641 in words is "sixty-seven million, one hundred eighty-one thousand, six hundred forty-one".