67921493 has 2 divisors, whose sum is σ = 67921494. Its totient is φ = 67921492.

The previous prime is 67921489. The next prime is 67921547. The reversal of 67921493 is 39412976.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 57410929 + 10510564 = 7577^2 + 3242^2 .

It is a cyclic number.

It is not a de Polignac number, because 67921493 - 2² = 67921489 is a prime.

It is a super-2 number, since 2×67921493² = 9226658422698098, which contains 22 as substring.

It is a Chen prime.

It is a self number, because there is not a number n which added to its sum of digits gives 67921493.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (67921423) 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, 33960746 + 33960747.

It is an arithmetic number, because the mean of its divisors is an integer number (33960747).

Almost surely, 2^67921493 is an apocalyptic number.

It is an amenable number.

67921493 is a deficient number, since it is larger than the sum of its proper divisors (1).

67921493 is an equidigital number, since it uses as much as digits as its factorization.

67921493 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 81648, while the sum is 41.

The square root of 67921493 is about 8241.4496904367. The cubic root of 67921493 is about 408.0083720088.

The spelling of 67921493 in words is "sixty-seven million, nine hundred twenty-one thousand, four hundred ninety-three".