67501921 has 2 divisors, whose sum is σ = 67501922. Its totient is φ = 67501920.

The previous prime is 67501919. The next prime is 67501933. The reversal of 67501921 is 12910576.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 44076321 + 23425600 = 6639^2 + 4840^2 .

It is a cyclic number.

It is not a de Polignac number, because 67501921 - 2¹ = 67501919 is a prime.

Together with 67501919, 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 (67501121) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 33750960 + 33750961.

It is an arithmetic number, because the mean of its divisors is an integer number (33750961).

Almost surely, 2^67501921 is an apocalyptic number.

It is an amenable number.

67501921 is a deficient number, since it is larger than the sum of its proper divisors (1).

67501921 is an equidigital number, since it uses as much as digits as its factorization.

67501921 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 3780, while the sum is 31.

The square root of 67501921 is about 8215.9552700827. The cubic root of 67501921 is about 407.1665049683.

The spelling of 67501921 in words is "sixty-seven million, five hundred one thousand, nine hundred twenty-one".