6921829457 has 2 divisors, whose sum is σ = 6921829458. Its totient is φ = 6921829456.

The previous prime is 6921829379. The next prime is 6921829471. The reversal of 6921829457 is 7549281296.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 6795694096 + 126135361 = 82436^2 + 11231^2 .

It is a cyclic number.

It is not a de Polignac number, because 6921829457 - 2¹⁶ = 6921763921 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 6921829399 and 6921829408.

It is not a weakly prime, because it can be changed into another prime (6921829357) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3460914728 + 3460914729.

It is an arithmetic number, because the mean of its divisors is an integer number (3460914729).

Almost surely, 2^6921829457 is an apocalyptic number.

It is an amenable number.

6921829457 is a deficient number, since it is larger than the sum of its proper divisors (1).

6921829457 is an equidigital number, since it uses as much as digits as its factorization.

6921829457 is an evil number, because the sum of its binary digits is even.

The product of its digits is 2177280, while the sum is 53.

The square root of 6921829457 is about 83197.5327578889. The cubic root of 6921829457 is about 1905.7838028603.

The spelling of 6921829457 in words is "six billion, nine hundred twenty-one million, eight hundred twenty-nine thousand, four hundred fifty-seven".