6521957 has 8 divisors (see below), whose sum is σ = 7047936. Its totient is φ = 5999472.

The previous prime is 6521951. The next prime is 6521987. The reversal of 6521957 is 7591256.

6521957 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 6521957 - 2¹⁶ = 6456421 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (6521951) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 4088 + ... + 5454.

It is an arithmetic number, because the mean of its divisors is an integer number (880992).

Almost surely, 2^6521957 is an apocalyptic number.

It is an amenable number.

6521957 is a deficient number, since it is larger than the sum of its proper divisors (525979).

6521957 is a wasteful number, since it uses less digits than its factorization.

6521957 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1747.

The product of its digits is 18900, while the sum is 35.

The square root of 6521957 is about 2553.8122483848. The cubic root of 6521957 is about 186.8354620440.

It can be divided in two parts, 65 and 21957, that multiplied together give a triangular number (1427205 = T₁₆₈₉).

The spelling of 6521957 in words is "six million, five hundred twenty-one thousand, nine hundred fifty-seven".