187311138349 has 4 divisors (see below), whose sum is σ = 189567899136. Its totient is φ = 185054377564.

The previous prime is 187311138319. The next prime is 187311138353. The reversal of 187311138349 is 943831113781.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 943831113781 = 439 ⋅2149956979.

It is a cyclic number.

It is not a de Polignac number, because 187311138349 - 2¹³ = 187311130157 is a prime.

It is a Smith number, since the sum of its digits (49) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (187311138319) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1128380269 + ... + 1128380434.

It is an arithmetic number, because the mean of its divisors is an integer number (47391974784).

Almost surely, 2^187311138349 is an apocalyptic number.

It is an amenable number.

187311138349 is a deficient number, since it is larger than the sum of its proper divisors (2256760787).

187311138349 is an equidigital number, since it uses as much as digits as its factorization.

187311138349 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2256760786.

The product of its digits is 435456, while the sum is 49.

The spelling of 187311138349 in words is "one hundred eighty-seven billion, three hundred eleven million, one hundred thirty-eight thousand, three hundred forty-nine".