18804898531 has 2 divisors, whose sum is σ = 18804898532. Its totient is φ = 18804898530.

The previous prime is 18804898529. The next prime is 18804898549. The reversal of 18804898531 is 13589840881.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 18804898531 - 2¹ = 18804898529 is a prime.

It is a super-2 number, since 2×18804898531² (a number of 21 digits) contains 22 as substring.

Together with 18804898529, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (18804892531) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9402449265 + 9402449266.

It is an arithmetic number, because the mean of its divisors is an integer number (9402449266).

Almost surely, 2^18804898531 is an apocalyptic number.

18804898531 is a deficient number, since it is larger than the sum of its proper divisors (1).

18804898531 is an equidigital number, since it uses as much as digits as its factorization.

18804898531 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 2211840, while the sum is 55.

It can be divided in two parts, 18804 and 898531, that added together give a triangular number (917335 = T₁₃₅₄).

The spelling of 18804898531 in words is "eighteen billion, eight hundred four million, eight hundred ninety-eight thousand, five hundred thirty-one".