2165228731 has 2 divisors, whose sum is σ = 2165228732. Its totient is φ = 2165228730.

The previous prime is 2165228701. The next prime is 2165228753. The reversal of 2165228731 is 1378225612.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 2165228731 - 2⁵ = 2165228699 is a prime.

It is a super-2 number, since 2×2165228731² = 9376430915095740722, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (2165228701) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1082614365 + 1082614366.

It is an arithmetic number, because the mean of its divisors is an integer number (1082614366).

Almost surely, 2^2165228731 is an apocalyptic number.

2165228731 is a deficient number, since it is larger than the sum of its proper divisors (1).

2165228731 is an equidigital number, since it uses as much as digits as its factorization.

2165228731 is an evil number, because the sum of its binary digits is even.

The product of its digits is 40320, while the sum is 37.

The square root of 2165228731 is about 46532.0183422125. The cubic root of 2165228731 is about 1293.7030253087.

The spelling of 2165228731 in words is "two billion, one hundred sixty-five million, two hundred twenty-eight thousand, seven hundred thirty-one".