7521997 has 8 divisors (see below), whose sum is σ = 8624000. Its totient is φ = 6426864.

The previous prime is 7521979. The next prime is 7522003. The reversal of 7521997 is 7991257.

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 7521997 - 2⁷ = 7521869 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (7521937) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 904 + ... + 3982.

It is an arithmetic number, because the mean of its divisors is an integer number (1078000).

Almost surely, 2^7521997 is an apocalyptic number.

It is an amenable number.

7521997 is a deficient number, since it is larger than the sum of its proper divisors (1102003).

7521997 is a wasteful number, since it uses less digits than its factorization.

7521997 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3435.

The product of its digits is 39690, while the sum is 40.

The square root of 7521997 is about 2742.6259314752. The cubic root of 7521997 is about 195.9345627034.

The spelling of 7521997 in words is "seven million, five hundred twenty-one thousand, nine hundred ninety-seven".