67907561 has 2 divisors, whose sum is σ = 67907562. Its totient is φ = 67907560.

The previous prime is 67907551. The next prime is 67907563. The reversal of 67907561 is 16570976.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 65286400 + 2621161 = 8080^2 + 1619^2 .

It is a cyclic number.

It is not a de Polignac number, because 67907561 - 2¹⁴ = 67891177 is a prime.

It is a super-2 number, since 2×67907561² = 9222873681937442, which contains 22 as substring.

Together with 67907563, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (67907563) 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, 33953780 + 33953781.

It is an arithmetic number, because the mean of its divisors is an integer number (33953781).

Almost surely, 2^67907561 is an apocalyptic number.

It is an amenable number.

67907561 is a deficient number, since it is larger than the sum of its proper divisors (1).

67907561 is an equidigital number, since it uses as much as digits as its factorization.

67907561 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 79380, while the sum is 41.

The square root of 67907561 is about 8240.6044074449. The cubic root of 67907561 is about 407.9804733222.

The spelling of 67907561 in words is "sixty-seven million, nine hundred seven thousand, five hundred sixty-one".