7018521 has 4 divisors (see below), whose sum is σ = 9358032. Its totient is φ = 4679012.

The previous prime is 7018513. The next prime is 7018541. The reversal of 7018521 is 1258107.

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 a cyclic number.

It is not a de Polignac number, because 7018521 - 2³ = 7018513 is a prime.

It is a D-number.

It is an alternating number because its digits alternate between odd and even.

7018521 is a lucky number.

It is a junction number, because it is equal to n+sod(n) for n = 7018491 and 7018500.

It is not an unprimeable number, because it can be changed into a prime (7018511) 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, 1169751 + ... + 1169756.

It is an arithmetic number, because the mean of its divisors is an integer number (2339508).

Almost surely, 2^7018521 is an apocalyptic number.

It is an amenable number.

7018521 is a deficient number, since it is larger than the sum of its proper divisors (2339511).

7018521 is a wasteful number, since it uses less digits than its factorization.

7018521 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2339510.

The product of its (nonzero) digits is 560, while the sum is 24.

The square root of 7018521 is about 2649.2491389071. The cubic root of 7018521 is about 191.4616811213.

The spelling of 7018521 in words is "seven million, eighteen thousand, five hundred twenty-one".