67722491 has 2 divisors, whose sum is σ = 67722492. Its totient is φ = 67722490.

The previous prime is 67722467. The next prime is 67722521. The reversal of 67722491 is 19422776.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-67722491 is a prime.

It is a Chen prime.

It is equal to p_3991943 and since 67722491 and 3991943 have the same sum of digits, it is a Honaker prime.

It is not a weakly prime, because it can be changed into another prime (67725491) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 33861245 + 33861246.

It is an arithmetic number, because the mean of its divisors is an integer number (33861246).

Almost surely, 2^67722491 is an apocalyptic number.

67722491 is a deficient number, since it is larger than the sum of its proper divisors (1).

67722491 is an equidigital number, since it uses as much as digits as its factorization.

67722491 is an evil number, because the sum of its binary digits is even.

The product of its digits is 42336, while the sum is 38.

The square root of 67722491 is about 8229.3675941715. The cubic root of 67722491 is about 407.6095100063.

The spelling of 67722491 in words is "sixty-seven million, seven hundred twenty-two thousand, four hundred ninety-one".