67561243 has 2 divisors, whose sum is σ = 67561244. Its totient is φ = 67561242.

The previous prime is 67561201. The next prime is 67561261. The reversal of 67561243 is 34216576.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 67561243 - 2¹⁷ = 67430171 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 67561199 and 67561208.

It is not a weakly prime, because it can be changed into another prime (67565243) 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, 33780621 + 33780622.

It is an arithmetic number, because the mean of its divisors is an integer number (33780622).

Almost surely, 2^67561243 is an apocalyptic number.

67561243 is a deficient number, since it is larger than the sum of its proper divisors (1).

67561243 is an equidigital number, since it uses as much as digits as its factorization.

67561243 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 30240, while the sum is 34.

The square root of 67561243 is about 8219.5646478387. The cubic root of 67561243 is about 407.2857453240.

The spelling of 67561243 in words is "sixty-seven million, five hundred sixty-one thousand, two hundred forty-three".