2156982461 has 2 divisors, whose sum is σ = 2156982462. Its totient is φ = 2156982460.

The previous prime is 2156982427. The next prime is 2156982463. The reversal of 2156982461 is 1642896512.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 2137675225 + 19307236 = 46235^2 + 4394^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-2156982461 is a prime.

Together with 2156982463, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (2156982463) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1078491230 + 1078491231.

It is an arithmetic number, because the mean of its divisors is an integer number (1078491231).

Almost surely, 2^2156982461 is an apocalyptic number.

It is an amenable number.

2156982461 is a deficient number, since it is larger than the sum of its proper divisors (1).

2156982461 is an equidigital number, since it uses as much as digits as its factorization.

2156982461 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 207360, while the sum is 44.

The square root of 2156982461 is about 46443.3252577806. The cubic root of 2156982461 is about 1292.0585806476.

The spelling of 2156982461 in words is "two billion, one hundred fifty-six million, nine hundred eighty-two thousand, four hundred sixty-one".