8492819921 has 2 divisors, whose sum is σ = 8492819922. Its totient is φ = 8492819920.

The previous prime is 8492819887. The next prime is 8492819957. The reversal of 8492819921 is 1299182948.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 8264809921 + 228010000 = 90911^2 + 15100^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-8492819921 is a prime.

It is not a weakly prime, because it can be changed into another prime (8492819021) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 4246409960 + 4246409961.

It is an arithmetic number, because the mean of its divisors is an integer number (4246409961).

Almost surely, 2^8492819921 is an apocalyptic number.

It is an amenable number.

8492819921 is a deficient number, since it is larger than the sum of its proper divisors (1).

8492819921 is an equidigital number, since it uses as much as digits as its factorization.

8492819921 is an evil number, because the sum of its binary digits is even.

The product of its digits is 746496, while the sum is 53.

The square root of 8492819921 is about 92156.4969006526. The cubic root of 8492819921 is about 2040.2527497456.

The spelling of 8492819921 in words is "eight billion, four hundred ninety-two million, eight hundred nineteen thousand, nine hundred twenty-one".