67933991 has 2 divisors, whose sum is σ = 67933992. Its totient is φ = 67933990.

The previous prime is 67933963. The next prime is 67934003. The reversal of 67933991 is 19933976.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 67933991 - 2¹⁰ = 67932967 is a prime.

It is a Sophie Germain prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (67933291) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 33966995 + 33966996.

It is an arithmetic number, because the mean of its divisors is an integer number (33966996).

Almost surely, 2^67933991 is an apocalyptic number.

67933991 is a deficient number, since it is larger than the sum of its proper divisors (1).

67933991 is an equidigital number, since it uses as much as digits as its factorization.

67933991 is an evil number, because the sum of its binary digits is even.

The product of its digits is 275562, while the sum is 47.

The square root of 67933991 is about 8242.2078959463. The cubic root of 67933991 is about 408.0333958791.

The spelling of 67933991 in words is "sixty-seven million, nine hundred thirty-three thousand, nine hundred ninety-one".