2285231981 has 2 divisors, whose sum is σ = 2285231982. Its totient is φ = 2285231980.

The previous prime is 2285231939. The next prime is 2285231983. The reversal of 2285231981 is 1891325822.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1766941225 + 518290756 = 42035^2 + 22766^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-2285231981 is a prime.

It is a super-2 number, since 2×2285231981² = 10444570413970368722, which contains 22 as substring.

Together with 2285231983, 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 (2285231983) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1142615990 + 1142615991.

It is an arithmetic number, because the mean of its divisors is an integer number (1142615991).

Almost surely, 2^2285231981 is an apocalyptic number.

It is an amenable number.

2285231981 is a deficient number, since it is larger than the sum of its proper divisors (1).

2285231981 is an equidigital number, since it uses as much as digits as its factorization.

2285231981 is an evil number, because the sum of its binary digits is even.

The product of its digits is 69120, while the sum is 41.

The square root of 2285231981 is about 47804.1000438247. The cubic root of 2285231981 is about 1317.1748540343.

The spelling of 2285231981 in words is "two billion, two hundred eighty-five million, two hundred thirty-one thousand, nine hundred eighty-one".