672521 has 2 divisors, whose sum is σ = 672522. Its totient is φ = 672520.

The previous prime is 672499. The next prime is 672557. The reversal of 672521 is 125276.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 672400 + 121 = 820^2 + 11^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-672521 is a prime.

It is an alternating number because its digits alternate between even and odd.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 672521.

It is not a weakly prime, because it can be changed into another prime (602521) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 336260 + 336261.

It is an arithmetic number, because the mean of its divisors is an integer number (336261).

2⁶⁷²⁵²¹ is an apocalyptic number.

It is an amenable number.

672521 is a deficient number, since it is larger than the sum of its proper divisors (1).

672521 is an equidigital number, since it uses as much as digits as its factorization.

672521 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 840, while the sum is 23.

The square root of 672521 is about 820.0737771689. The cubic root of 672521 is about 87.6130131554.

Adding to 672521 its reverse (125276), we get a palindrome (797797).

It can be divided in two parts, 6 and 72521, that added together give a palindrome (72527).

The spelling of 672521 in words is "six hundred seventy-two thousand, five hundred twenty-one".