6469921 has 2 divisors, whose sum is σ = 6469922. Its totient is φ = 6469920.

The previous prime is 6469919. The next prime is 6469943. The reversal of 6469921 is 1299646.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 3845521 + 2624400 = 1961^2 + 1620^2 .

It is a cyclic number.

It is not a de Polignac number, because 6469921 - 2¹ = 6469919 is a prime.

Together with 6469919, it forms a pair of twin primes.

It is a d-powerful number, because it can be written as 6 + 4⁴ + 6⁸ + 9⁴ + 9⁷ + 2⁹ + 1 .

6469921 is a lucky number.

It is not a weakly prime, because it can be changed into another prime (6469951) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3234960 + 3234961.

It is an arithmetic number, because the mean of its divisors is an integer number (3234961).

Almost surely, 2^6469921 is an apocalyptic number.

It is an amenable number.

6469921 is a deficient number, since it is larger than the sum of its proper divisors (1).

6469921 is an equidigital number, since it uses as much as digits as its factorization.

6469921 is an evil number, because the sum of its binary digits is even.

The product of its digits is 23328, while the sum is 37.

The square root of 6469921 is about 2543.6039392956. The cubic root of 6469921 is about 186.3372403334.

The spelling of 6469921 in words is "six million, four hundred sixty-nine thousand, nine hundred twenty-one".