18739114981 has 2 divisors, whose sum is σ = 18739114982. Its totient is φ = 18739114980.

The previous prime is 18739114939. The next prime is 18739115023. The reversal of 18739114981 is 18941193781.

It is a happy number.

It is a balanced prime because it is at equal distance from previous prime (18739114939) and next prime (18739115023).

It can be written as a sum of positive squares in only one way, i.e., 16991122500 + 1747992481 = 130350^2 + 41809^2 .

It is a cyclic number.

It is not a de Polignac number, because 18739114981 - 2¹¹ = 18739112933 is a prime.

It is a super-2 number, since 2×18739114981² (a number of 21 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (18739114181) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9369557490 + 9369557491.

It is an arithmetic number, because the mean of its divisors is an integer number (9369557491).

Almost surely, 2^18739114981 is an apocalyptic number.

It is an amenable number.

18739114981 is a deficient number, since it is larger than the sum of its proper divisors (1).

18739114981 is an equidigital number, since it uses as much as digits as its factorization.

18739114981 is an evil number, because the sum of its binary digits is even.

The product of its digits is 435456, while the sum is 52.

The spelling of 18739114981 in words is "eighteen billion, seven hundred thirty-nine million, one hundred fourteen thousand, nine hundred eighty-one".