2161850651 has 2 divisors, whose sum is σ = 2161850652. Its totient is φ = 2161850650.

The previous prime is 2161850633. The next prime is 2161850659. The reversal of 2161850651 is 1560581612.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 2161850651 - 2¹⁴ = 2161834267 is a prime.

It is a super-3 number, since 3×2161850651³ (a number of 29 digits) contains 333 as substring.

It is not a weakly prime, because it can be changed into another prime (2161850659) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1080925325 + 1080925326.

It is an arithmetic number, because the mean of its divisors is an integer number (1080925326).

Almost surely, 2^2161850651 is an apocalyptic number.

2161850651 is a deficient number, since it is larger than the sum of its proper divisors (1).

2161850651 is an equidigital number, since it uses as much as digits as its factorization.

2161850651 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 14400, while the sum is 35.

The square root of 2161850651 is about 46495.7057264432. The cubic root of 2161850651 is about 1293.0298851821.

The spelling of 2161850651 in words is "two billion, one hundred sixty-one million, eight hundred fifty thousand, six hundred fifty-one".