2161846993 has 2 divisors, whose sum is σ = 2161846994. Its totient is φ = 2161846992.

The previous prime is 2161846943. The next prime is 2161847003. The reversal of 2161846993 is 3996481612.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1738639809 + 423207184 = 41697^2 + 20572^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-2161846993 is a prime.

It is a super-2 number, since 2×2161846993² = 9347164842286284098, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (2161846913) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1080923496 + 1080923497.

It is an arithmetic number, because the mean of its divisors is an integer number (1080923497).

Almost surely, 2^2161846993 is an apocalyptic number.

It is an amenable number.

2161846993 is a deficient number, since it is larger than the sum of its proper divisors (1).

2161846993 is an equidigital number, since it uses as much as digits as its factorization.

2161846993 is an evil number, because the sum of its binary digits is even.

The product of its digits is 559872, while the sum is 49.

The square root of 2161846993 is about 46495.6663894604. Note that the first 3 decimals coincide. The cubic root of 2161846993 is about 1293.0291558832.

The spelling of 2161846993 in words is "two billion, one hundred sixty-one million, eight hundred forty-six thousand, nine hundred ninety-three".