6972521 has 8 divisors (see below), whose sum is σ = 7144200. Its totient is φ = 6802432.

The previous prime is 6972517. The next prime is 6972547. The reversal of 6972521 is 1252796.

It can be written as a sum of positive squares in 4 ways, for example, as 3857296 + 3115225 = 1964^2 + 1765^2 .

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 6972521 - 2² = 6972517 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (6972571) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 15305 + ... + 15753.

It is an arithmetic number, because the mean of its divisors is an integer number (893025).

Almost surely, 2^6972521 is an apocalyptic number.

It is an amenable number.

6972521 is a deficient number, since it is larger than the sum of its proper divisors (171679).

6972521 is a wasteful number, since it uses less digits than its factorization.

6972521 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 795.

The product of its digits is 7560, while the sum is 32.

The square root of 6972521 is about 2640.5531617447. The cubic root of 6972521 is about 191.0424784225.

The spelling of 6972521 in words is "six million, nine hundred seventy-two thousand, five hundred twenty-one".