67037921 has 2 divisors, whose sum is σ = 67037922. Its totient is φ = 67037920.

The previous prime is 67037917. The next prime is 67037923. The reversal of 67037921 is 12973076.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 33814225 + 33223696 = 5815^2 + 5764^2 .

It is a cyclic number.

It is not a de Polignac number, because 67037921 - 2² = 67037917 is a prime.

Together with 67037923, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (67037923) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 33518960 + 33518961.

It is an arithmetic number, because the mean of its divisors is an integer number (33518961).

Almost surely, 2^67037921 is an apocalyptic number.

It is an amenable number.

67037921 is a deficient number, since it is larger than the sum of its proper divisors (1).

67037921 is an equidigital number, since it uses as much as digits as its factorization.

67037921 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 15876, while the sum is 35.

The square root of 67037921 is about 8187.6688379538. The cubic root of 67037921 is about 406.2314214462.

The spelling of 67037921 in words is "sixty-seven million, thirty-seven thousand, nine hundred twenty-one".