2161262651 has 2 divisors, whose sum is σ = 2161262652. Its totient is φ = 2161262650.

The previous prime is 2161262629. The next prime is 2161262659. The reversal of 2161262651 is 1562621612.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 2161262651 - 2¹⁸ = 2161000507 is a prime.

It is not a weakly prime, because it can be changed into another prime (2161262659) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1080631325 + 1080631326.

It is an arithmetic number, because the mean of its divisors is an integer number (1080631326).

Almost surely, 2^2161262651 is an apocalyptic number.

2161262651 is a deficient number, since it is larger than the sum of its proper divisors (1).

2161262651 is an equidigital number, since it uses as much as digits as its factorization.

2161262651 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 8640, while the sum is 32.

The square root of 2161262651 is about 46489.3821318374. The cubic root of 2161262651 is about 1292.9126445032.

The spelling of 2161262651 in words is "two billion, one hundred sixty-one million, two hundred sixty-two thousand, six hundred fifty-one".