67911989 has 2 divisors, whose sum is σ = 67911990. Its totient is φ = 67911988.

The previous prime is 67911959. The next prime is 67912001. The reversal of 67911989 is 98911976.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 66994225 + 917764 = 8185^2 + 958^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-67911989 is a prime.

It is a super-2 number, since 2×67911989² = 9224076499872242, which contains 22 as substring.

It is a Sophie Germain prime.

It is a Curzon number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (67911919) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 33955994 + 33955995.

It is an arithmetic number, because the mean of its divisors is an integer number (33955995).

Almost surely, 2^67911989 is an apocalyptic number.

It is an amenable number.

67911989 is a deficient number, since it is larger than the sum of its proper divisors (1).

67911989 is an equidigital number, since it uses as much as digits as its factorization.

67911989 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 244944, while the sum is 50.

The square root of 67911989 is about 8240.8730726786. The cubic root of 67911989 is about 407.9893407602.

The spelling of 67911989 in words is "sixty-seven million, nine hundred eleven thousand, nine hundred eighty-nine".