67551971 has 2 divisors, whose sum is σ = 67551972. Its totient is φ = 67551970.

The previous prime is 67551959. The next prime is 67551983. The reversal of 67551971 is 17915576.

It is a balanced prime because it is at equal distance from previous prime (67551959) and next prime (67551983).

It is a cyclic number.

It is not a de Polignac number, because 67551971 - 2⁶ = 67551907 is a prime.

It is not a weakly prime, because it can be changed into another prime (67551901) 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, 33775985 + 33775986.

It is an arithmetic number, because the mean of its divisors is an integer number (33775986).

Almost surely, 2^67551971 is an apocalyptic number.

67551971 is a deficient number, since it is larger than the sum of its proper divisors (1).

67551971 is an equidigital number, since it uses as much as digits as its factorization.

67551971 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 66150, while the sum is 41.

The square root of 67551971 is about 8219.0006083465. Note that the first 3 decimals coincide. The cubic root of 67551971 is about 407.2671127174.

The spelling of 67551971 in words is "sixty-seven million, five hundred fifty-one thousand, nine hundred seventy-one".