6490521 has 6 divisors (see below), whose sum is σ = 9375210. Its totient is φ = 4327008.

The previous prime is 6490511. The next prime is 6490543. The reversal of 6490521 is 1250946.

It can be written as a sum of positive squares in only one way, i.e., 4347225 + 2143296 = 2085^2 + 1464^2 .

It is not a de Polignac number, because 6490521 - 2¹⁴ = 6474137 is a prime.

It is an Ulam number.

6490521 is a lucky number.

It is not an unprimeable number, because it can be changed into a prime (6490511) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 360576 + ... + 360593.

It is an arithmetic number, because the mean of its divisors is an integer number (1562535).

Almost surely, 2^6490521 is an apocalyptic number.

It is an amenable number.

6490521 is a deficient number, since it is larger than the sum of its proper divisors (2884689).

6490521 is a wasteful number, since it uses less digits than its factorization.

6490521 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 721175 (or 721172 counting only the distinct ones).

The product of its (nonzero) digits is 2160, while the sum is 27.

The square root of 6490521 is about 2547.6500937138. The cubic root of 6490521 is about 186.5347945441.

The spelling of 6490521 in words is "six million, four hundred ninety thousand, five hundred twenty-one".