7553521 has 2 divisors, whose sum is σ = 7553522. Its totient is φ = 7553520.

The previous prime is 7553503. The next prime is 7553531. The reversal of 7553521 is 1253557.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 7535025 + 18496 = 2745^2 + 136^2 .

It is an emirp because it is prime and its reverse (1253557) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 7553521 - 2⁹ = 7553009 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 7553521.

It is not a weakly prime, because it can be changed into another prime (7553531) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3776760 + 3776761.

It is an arithmetic number, because the mean of its divisors is an integer number (3776761).

Almost surely, 2^7553521 is an apocalyptic number.

It is an amenable number.

7553521 is a deficient number, since it is larger than the sum of its proper divisors (1).

7553521 is an equidigital number, since it uses as much as digits as its factorization.

7553521 is an evil number, because the sum of its binary digits is even.

The product of its digits is 5250, while the sum is 28.

The square root of 7553521 is about 2748.3669696749. The cubic root of 7553521 is about 196.2078958182.

The spelling of 7553521 in words is "seven million, five hundred fifty-three thousand, five hundred twenty-one".