6471921 has 4 divisors (see below), whose sum is σ = 8629232. Its totient is φ = 4314612.

The previous prime is 6471919. The next prime is 6471953. The reversal of 6471921 is 1291746.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is not a de Polignac number, because 6471921 - 2¹ = 6471919 is a prime.

It is a super-2 number, since 2×6471921² = 83771522860482, which contains 22 as substring.

It is a D-number.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (6471121) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1078651 + ... + 1078656.

It is an arithmetic number, because the mean of its divisors is an integer number (2157308).

Almost surely, 2^6471921 is an apocalyptic number.

It is an amenable number.

6471921 is a deficient number, since it is larger than the sum of its proper divisors (2157311).

6471921 is a wasteful number, since it uses less digits than its factorization.

6471921 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2157310.

The product of its digits is 3024, while the sum is 30.

The square root of 6471921 is about 2543.9970518851. The cubic root of 6471921 is about 186.3564387176.

The spelling of 6471921 in words is "six million, four hundred seventy-one thousand, nine hundred twenty-one".