185113489381 has 2 divisors, whose sum is σ = 185113489382. Its totient is φ = 185113489380.

The previous prime is 185113489357. The next prime is 185113489399. The reversal of 185113489381 is 183984311581.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 160756893025 + 24356596356 = 400945^2 + 156066^2 .

It is a cyclic number.

It is not a de Polignac number, because 185113489381 - 2²¹ = 185111392229 is a prime.

It is a super-2 number, since 2×185113489381² (a number of 23 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (185113489081) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 92556744690 + 92556744691.

It is an arithmetic number, because the mean of its divisors is an integer number (92556744691).

Almost surely, 2^185113489381 is an apocalyptic number.

It is an amenable number.

185113489381 is a deficient number, since it is larger than the sum of its proper divisors (1).

185113489381 is an equidigital number, since it uses as much as digits as its factorization.

185113489381 is an evil number, because the sum of its binary digits is even.

The product of its digits is 829440, while the sum is 52.

The spelling of 185113489381 in words is "one hundred eighty-five billion, one hundred thirteen million, four hundred eighty-nine thousand, three hundred eighty-one".