921918853 has 2 divisors, whose sum is σ = 921918854. Its totient is φ = 921918852.

The previous prime is 921918847. The next prime is 921918859. The reversal of 921918853 is 358819129.

It is a balanced prime because it is at equal distance from previous prime (921918847) and next prime (921918859).

It can be written as a sum of positive squares in only one way, i.e., 614197089 + 307721764 = 24783^2 + 17542^2 .

It is an emirp because it is prime and its reverse (358819129) is a distict prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-921918853 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (921918859) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 460959426 + 460959427.

It is an arithmetic number, because the mean of its divisors is an integer number (460959427).

Almost surely, 2^921918853 is an apocalyptic number.

It is an amenable number.

921918853 is a deficient number, since it is larger than the sum of its proper divisors (1).

921918853 is an equidigital number, since it uses as much as digits as its factorization.

921918853 is an evil number, because the sum of its binary digits is even.

The product of its digits is 155520, while the sum is 46.

The square root of 921918853 is about 30363.1166549154. The cubic root of 921918853 is about 973.2645360013.

The spelling of 921918853 in words is "nine hundred twenty-one million, nine hundred eighteen thousand, eight hundred fifty-three".