7622521 has 4 divisors (see below), whose sum is σ = 7661412. Its totient is φ = 7583632.

The previous prime is 7622519. The next prime is 7622561. The reversal of 7622521 is 1252267.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 7096896 + 525625 = 2664^2 + 725^2 .

It is a cyclic number.

It is not a de Polignac number, because 7622521 - 2¹ = 7622519 is a prime.

It is a Duffinian number.

7622521 is a lucky number.

It is not an unprimeable number, because it can be changed into a prime (7622561) 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, 19150 + ... + 19543.

It is an arithmetic number, because the mean of its divisors is an integer number (1915353).

Almost surely, 2^7622521 is an apocalyptic number.

It is an amenable number.

7622521 is a deficient number, since it is larger than the sum of its proper divisors (38891).

7622521 is a wasteful number, since it uses less digits than its factorization.

7622521 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 38890.

The product of its digits is 1680, while the sum is 25.

The square root of 7622521 is about 2760.8913415779. The cubic root of 7622521 is about 196.8035266212.

Adding to 7622521 its reverse (1252267), we get a palindrome (8874788).

The spelling of 7622521 in words is "seven million, six hundred twenty-two thousand, five hundred twenty-one".