921385001 has 2 divisors, whose sum is σ = 921385002. Its totient is φ = 921385000.

The previous prime is 921384983. The next prime is 921385009. The reversal of 921385001 is 100583129.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 584478976 + 336906025 = 24176^2 + 18355^2 .

It is a cyclic number.

It is not a de Polignac number, because 921385001 - 2²² = 917190697 is a prime.

It is a Sophie Germain prime.

It is a Curzon number.

It is not a weakly prime, because it can be changed into another prime (921385009) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 460692500 + 460692501.

It is an arithmetic number, because the mean of its divisors is an integer number (460692501).

Almost surely, 2^921385001 is an apocalyptic number.

It is an amenable number.

921385001 is a deficient number, since it is larger than the sum of its proper divisors (1).

921385001 is an equidigital number, since it uses as much as digits as its factorization.

921385001 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 2160, while the sum is 29.

The square root of 921385001 is about 30354.3242553676. The cubic root of 921385001 is about 973.0766382126.

The spelling of 921385001 in words is "nine hundred twenty-one million, three hundred eighty-five thousand, one".