67617961 has 2 divisors, whose sum is σ = 67617962. Its totient is φ = 67617960.

The previous prime is 67617947. The next prime is 67617971. The reversal of 67617961 is 16971676.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 67322025 + 295936 = 8205^2 + 544^2 .

It is a cyclic number.

It is not a de Polignac number, because 67617961 - 2¹¹ = 67615913 is a prime.

It is not a weakly prime, because it can be changed into another prime (67617911) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 33808980 + 33808981.

It is an arithmetic number, because the mean of its divisors is an integer number (33808981).

Almost surely, 2^67617961 is an apocalyptic number.

It is an amenable number.

67617961 is a deficient number, since it is larger than the sum of its proper divisors (1).

67617961 is an equidigital number, since it uses as much as digits as its factorization.

67617961 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 95256, while the sum is 43.

The square root of 67617961 is about 8223.0141067616. The cubic root of 67617961 is about 407.3996862492.

The spelling of 67617961 in words is "sixty-seven million, six hundred seventeen thousand, nine hundred sixty-one".