7663121 has 4 divisors (see below), whose sum is σ = 7670244. Its totient is φ = 7656000.

The previous prime is 7663109. The next prime is 7663127. The reversal of 7663121 is 1213667.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It can be written as a sum of positive squares in 2 ways, for example, as 7349521 + 313600 = 2711^2 + 560^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-7663121 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (7663127) 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, 1580 + ... + 4221.

It is an arithmetic number, because the mean of its divisors is an integer number (1917561).

Almost surely, 2^7663121 is an apocalyptic number.

It is an amenable number.

7663121 is a deficient number, since it is larger than the sum of its proper divisors (7123).

7663121 is a wasteful number, since it uses less digits than its factorization.

7663121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7122.

The product of its digits is 1512, while the sum is 26.

The square root of 7663121 is about 2768.2342747679. The cubic root of 7663121 is about 197.1523210618.

Adding to 7663121 its reverse (1213667), we get a palindrome (8876788).

The spelling of 7663121 in words is "seven million, six hundred sixty-three thousand, one hundred twenty-one".