921993701 has 2 divisors, whose sum is σ = 921993702. Its totient is φ = 921993700.

The previous prime is 921993643. The next prime is 921993703. The reversal of 921993701 is 107399129.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 678602500 + 243391201 = 26050^2 + 15601^2 .

It is an emirp because it is prime and its reverse (107399129) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 921993701 - 2⁶ = 921993637 is a prime.

It is a Sophie Germain prime.

Together with 921993703, it forms a pair of twin primes.

It is a Chen prime.

It is a Curzon number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (921993703) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 460996850 + 460996851.

It is an arithmetic number, because the mean of its divisors is an integer number (460996851).

Almost surely, 2^921993701 is an apocalyptic number.

It is an amenable number.

921993701 is a deficient number, since it is larger than the sum of its proper divisors (1).

921993701 is an equidigital number, since it uses as much as digits as its factorization.

921993701 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 30618, while the sum is 41.

The square root of 921993701 is about 30364.3491779422. The cubic root of 921993701 is about 973.2908741591.

The spelling of 921993701 in words is "nine hundred twenty-one million, nine hundred ninety-three thousand, seven hundred one".