7121563 has 4 divisors (see below), whose sum is σ = 7131400. Its totient is φ = 7111728.

The previous prime is 7121539. The next prime is 7121573. The reversal of 7121563 is 3651217.

7121563 is nontrivially palindromic in base 2.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-7121563 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (7121503) 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 3 ways as a sum of consecutive naturals, for example, 3738 + ... + 5311.

It is an arithmetic number, because the mean of its divisors is an integer number (1782850).

Almost surely, 2^7121563 is an apocalyptic number.

7121563 is a deficient number, since it is larger than the sum of its proper divisors (9837).

7121563 is an equidigital number, since it uses as much as digits as its factorization.

7121563 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9836.

The product of its digits is 1260, while the sum is 25.

The square root of 7121563 is about 2668.6256762611. The cubic root of 7121563 is about 192.3941105385.

The spelling of 7121563 in words is "seven million, one hundred twenty-one thousand, five hundred sixty-three".