74996921 has 2 divisors, whose sum is σ = 74996922. Its totient is φ = 74996920.

The previous prime is 74996897. The next prime is 74996923. The reversal of 74996921 is 12969947.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 52765696 + 22231225 = 7264^2 + 4715^2 .

It is an emirp because it is prime and its reverse (12969947) is a distict prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-74996921 is a prime.

It is a Sophie Germain prime.

Together with 74996923, it forms a pair of twin primes.

It is a Chen prime.

It is a Curzon number.

It is not a weakly prime, because it can be changed into another prime (74996923) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 37498460 + 37498461.

It is an arithmetic number, because the mean of its divisors is an integer number (37498461).

Almost surely, 2^74996921 is an apocalyptic number.

It is an amenable number.

74996921 is a deficient number, since it is larger than the sum of its proper divisors (1).

74996921 is an equidigital number, since it uses as much as digits as its factorization.

74996921 is an evil number, because the sum of its binary digits is even.

The product of its digits is 244944, while the sum is 47.

The square root of 74996921 is about 8660.0762698720. The cubic root of 74996921 is about 421.7105616182.

The spelling of 74996921 in words is "seventy-four million, nine hundred ninety-six thousand, nine hundred twenty-one".