7122861 has 12 divisors (see below), whose sum is σ = 10312380. Its totient is φ = 4737600.

The previous prime is 7122859. The next prime is 7122887. The reversal of 7122861 is 1682217.

It can be written as a sum of positive squares in 2 ways, for example, as 3261636 + 3861225 = 1806^2 + 1965^2 .

It is not a de Polignac number, because 7122861 - 2¹ = 7122859 is a prime.

It is a Smith number, since the sum of its digits (27) coincides with the sum of the digits of its prime factors.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (7122061) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 5745 + ... + 6873.

It is an arithmetic number, because the mean of its divisors is an integer number (859365).

Almost surely, 2^7122861 is an apocalyptic number.

It is an amenable number.

7122861 is a deficient number, since it is larger than the sum of its proper divisors (3189519).

7122861 is a wasteful number, since it uses less digits than its factorization.

7122861 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1836 (or 1833 counting only the distinct ones).

The product of its digits is 1344, while the sum is 27.

The square root of 7122861 is about 2668.8688615217. The cubic root of 7122861 is about 192.4057986274.

It can be divided in two parts, 71228 and 61, that added together give a square (71289 = 267²).

The spelling of 7122861 in words is "seven million, one hundred twenty-two thousand, eight hundred sixty-one".