7021609 has 4 divisors (see below), whose sum is σ = 8024704. Its totient is φ = 6018516.

The previous prime is 7021607. The next prime is 7021627. The reversal of 7021609 is 9061207.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is not a de Polignac number, because 7021609 - 2¹ = 7021607 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (7021607) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 501537 + ... + 501550.

It is an arithmetic number, because the mean of its divisors is an integer number (2006176).

Almost surely, 2^7021609 is an apocalyptic number.

It is an amenable number.

7021609 is a deficient number, since it is larger than the sum of its proper divisors (1003095).

7021609 is a wasteful number, since it uses less digits than its factorization.

7021609 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1003094.

The product of its (nonzero) digits is 756, while the sum is 25.

The square root of 7021609 is about 2649.8318814597. The cubic root of 7021609 is about 191.4897566936.

The spelling of 7021609 in words is "seven million, twenty-one thousand, six hundred nine".