3618158981 has 2 divisors, whose sum is σ = 3618158982. Its totient is φ = 3618158980.

The previous prime is 3618158969. The next prime is 3618158983. The reversal of 3618158981 is 1898518163.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 2327194081 + 1290964900 = 48241^2 + 35930^2 .

It is a cyclic number.

It is not a de Polignac number, because 3618158981 - 2⁶ = 3618158917 is a prime.

It is a super-2 number, since 2×3618158981² = 26182148823581916722, which contains 22 as substring.

Together with 3618158983, 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 (3618158983) 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, 1809079490 + 1809079491.

It is an arithmetic number, because the mean of its divisors is an integer number (1809079491).

Almost surely, 2^3618158981 is an apocalyptic number.

It is an amenable number.

3618158981 is a deficient number, since it is larger than the sum of its proper divisors (1).

3618158981 is an equidigital number, since it uses as much as digits as its factorization.

3618158981 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 414720, while the sum is 50.

The square root of 3618158981 is about 60151.1344947043. The cubic root of 3618158981 is about 1535.1914697126.

The spelling of 3618158981 in words is "three billion, six hundred eighteen million, one hundred fifty-eight thousand, nine hundred eighty-one".