18900524381 has 2 divisors, whose sum is σ = 18900524382. Its totient is φ = 18900524380.

The previous prime is 18900524369. The next prime is 18900524387. The reversal of 18900524381 is 18342500981.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 17172792025 + 1727732356 = 131045^2 + 41566^2 .

It is a cyclic number.

It is not a de Polignac number, because 18900524381 - 2³⁴ = 1720655197 is a prime.

It is a super-2 number, since 2×18900524381² (a number of 21 digits) contains 22 as substring.

It is a Sophie Germain prime.

It is a Curzon number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (18900524387) 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, 9450262190 + 9450262191.

It is an arithmetic number, because the mean of its divisors is an integer number (9450262191).

Almost surely, 2^18900524381 is an apocalyptic number.

It is an amenable number.

18900524381 is a deficient number, since it is larger than the sum of its proper divisors (1).

18900524381 is an equidigital number, since it uses as much as digits as its factorization.

18900524381 is an odious number, because the sum of its binary digits is odd.

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

The spelling of 18900524381 in words is "eighteen billion, nine hundred million, five hundred twenty-four thousand, three hundred eighty-one".