2181010831 has 2 divisors, whose sum is σ = 2181010832. Its totient is φ = 2181010830.

The previous prime is 2181010829. The next prime is 2181010841. The reversal of 2181010831 is 1380101812.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 2181010831 - 2¹ = 2181010829 is a prime.

It is a super-2 number, since 2×2181010831² = 9513616489878621122, which contains 22 as substring.

Together with 2181010829, it forms a pair of twin primes.

It is a junction number, because it is equal to n+sod(n) for n = 2181010796 and 2181010805.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (2181010841) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1090505415 + 1090505416.

It is an arithmetic number, because the mean of its divisors is an integer number (1090505416).

Almost surely, 2^2181010831 is an apocalyptic number.

2181010831 is a deficient number, since it is larger than the sum of its proper divisors (1).

2181010831 is an equidigital number, since it uses as much as digits as its factorization.

2181010831 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 384, while the sum is 25.

The square root of 2181010831 is about 46701.2936758715. The cubic root of 2181010831 is about 1296.8386361206.

The spelling of 2181010831 in words is "two billion, one hundred eighty-one million, ten thousand, eight hundred thirty-one".