7722161 has 4 divisors (see below), whose sum is σ = 7749924. Its totient is φ = 7694400.

The previous prime is 7722139. The next prime is 7722163. The reversal of 7722161 is 1612277.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 1612277 = 23 ⋅70099.

It can be written as a sum of positive squares in 2 ways, for example, as 6553600 + 1168561 = 2560^2 + 1081^2 .

It is a cyclic number.

It is not a de Polignac number, because 7722161 - 2¹⁸ = 7460017 is a prime.

It is an Ulam number.

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 7722161.

It is not an unprimeable number, because it can be changed into a prime (7722163) 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, 13460 + ... + 14021.

It is an arithmetic number, because the mean of its divisors is an integer number (1937481).

Almost surely, 2^7722161 is an apocalyptic number.

It is an amenable number.

7722161 is a deficient number, since it is larger than the sum of its proper divisors (27763).

7722161 is a wasteful number, since it uses less digits than its factorization.

7722161 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 27762.

The product of its digits is 1176, while the sum is 26.

The square root of 7722161 is about 2778.8776511390. The cubic root of 7722161 is about 197.6573419037.

The spelling of 7722161 in words is "seven million, seven hundred twenty-two thousand, one hundred sixty-one".