6721525 has 6 divisors (see below), whose sum is σ = 8334722. Its totient is φ = 5377200.

The previous prime is 6721523. The next prime is 6721541. The reversal of 6721525 is 5251276.

It can be written as a sum of positive squares in 3 ways, for example, as 285156 + 6436369 = 534^2 + 2537^2 .

It is not a de Polignac number, because 6721525 - 2¹ = 6721523 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 6721493 and 6721502.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (6721523) 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, 134406 + ... + 134455.

Almost surely, 2^6721525 is an apocalyptic number.

It is an amenable number.

6721525 is a deficient number, since it is larger than the sum of its proper divisors (1613197).

6721525 is a wasteful number, since it uses less digits than its factorization.

6721525 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 268871 (or 268866 counting only the distinct ones).

The product of its digits is 4200, while the sum is 28.

The square root of 6721525 is about 2592.5904034382. The cubic root of 6721525 is about 188.7220329015.

It can be divided in two parts, 672 and 1525, that added together give a cube (2197 = 13³).

The spelling of 6721525 in words is "six million, seven hundred twenty-one thousand, five hundred twenty-five".