2633155981 has 2 divisors, whose sum is σ = 2633155982. Its totient is φ = 2633155980.

The previous prime is 2633155979. The next prime is 2633155991. The reversal of 2633155981 is 1895513362.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 2228784100 + 404371881 = 47210^2 + 20109^2 .

It is a cyclic number.

It is not a de Polignac number, because 2633155981 - 2¹ = 2633155979 is a prime.

It is a super-2 number, since 2×2633155981² = 13867020840552144722, which contains 22 as substring.

Together with 2633155979, it forms a pair of twin primes.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (2633155901) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1316577990 + 1316577991.

It is an arithmetic number, because the mean of its divisors is an integer number (1316577991).

Almost surely, 2^2633155981 is an apocalyptic number.

It is an amenable number.

2633155981 is a deficient number, since it is larger than the sum of its proper divisors (1).

2633155981 is an equidigital number, since it uses as much as digits as its factorization.

2633155981 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 194400, while the sum is 43.

The square root of 2633155981 is about 51314.2863245705. The cubic root of 2633155981 is about 1380.8892925530.

The spelling of 2633155981 in words is "two billion, six hundred thirty-three million, one hundred fifty-five thousand, nine hundred eighty-one".