7671521 has 12 divisors (see below), whose sum is σ = 9082836. Its totient is φ = 6436320.

The previous prime is 7671511. The next prime is 7671523. The reversal of 7671521 is 1251767.

7671521 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 2 ways, for example, as 1600225 + 6071296 = 1265^2 + 2464^2 .

It is not a de Polignac number, because 7671521 - 2¹⁸ = 7409377 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (7671523) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 866 + ... + 4011.

It is an arithmetic number, because the mean of its divisors is an integer number (756903).

Almost surely, 2^7671521 is an apocalyptic number.

It is an amenable number.

7671521 is a deficient number, since it is larger than the sum of its proper divisors (1411315).

7671521 is a wasteful number, since it uses less digits than its factorization.

7671521 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4912 (or 4901 counting only the distinct ones).

The product of its digits is 2940, while the sum is 29.

The square root of 7671521 is about 2769.7510718474. The cubic root of 7671521 is about 197.2243315284.

It can be divided in two parts, 7671 and 521, that added together give a 13-th power (8192 = 2¹³).

The spelling of 7671521 in words is "seven million, six hundred seventy-one thousand, five hundred twenty-one".