921939593 has 2 divisors, whose sum is σ = 921939594. Its totient is φ = 921939592.

The previous prime is 921939583. The next prime is 921939607. The reversal of 921939593 is 395939129.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 685025929 + 236913664 = 26173^2 + 15392^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-921939593 is a prime.

It is a super-2 number, since 2×921939593² = 1699945226282011298, which contains 22 as substring.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (921939503) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 460969796 + 460969797.

It is an arithmetic number, because the mean of its divisors is an integer number (460969797).

Almost surely, 2^921939593 is an apocalyptic number.

It is an amenable number.

921939593 is a deficient number, since it is larger than the sum of its proper divisors (1).

921939593 is an equidigital number, since it uses as much as digits as its factorization.

921939593 is an evil number, because the sum of its binary digits is even.

The product of its digits is 590490, while the sum is 50.

The square root of 921939593 is about 30363.4581857864. The cubic root of 921939593 is about 973.2718343136.

The spelling of 921939593 in words is "nine hundred twenty-one million, nine hundred thirty-nine thousand, five hundred ninety-three".