7691221 has 4 divisors (see below), whose sum is σ = 7854912. Its totient is φ = 7527532.

The previous prime is 7691213. The next prime is 7691261. The reversal of 7691221 is 1221967.

It is a happy number.

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, and also an emirpimes, since its reverse is a distinct semiprime: 1221967 = 23 ⋅53129.

It is a cyclic number.

It is not a de Polignac number, because 7691221 - 2³ = 7691213 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 7691221.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (7691261) 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, 81775 + ... + 81868.

It is an arithmetic number, because the mean of its divisors is an integer number (1963728).

Almost surely, 2^7691221 is an apocalyptic number.

It is an amenable number.

7691221 is a deficient number, since it is larger than the sum of its proper divisors (163691).

7691221 is a wasteful number, since it uses less digits than its factorization.

7691221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 163690.

The product of its digits is 1512, while the sum is 28.

The square root of 7691221 is about 2773.3050679649. The cubic root of 7691221 is about 197.3930072626.

The spelling of 7691221 in words is "seven million, six hundred ninety-one thousand, two hundred twenty-one".