185304138431 has 4 divisors (see below), whose sum is σ = 188444886600. Its totient is φ = 182163390264.

The previous prime is 185304138407. The next prime is 185304138449. The reversal of 185304138431 is 134831403581.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 134831403581 = 7 ⋅19261629083.

It is a cyclic number.

It is not a de Polignac number, because 185304138431 - 2¹⁰ = 185304137407 is a prime.

It is a super-2 number, since 2×185304138431² (a number of 23 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (185304138451) 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, 1570373996 + ... + 1570374113.

It is an arithmetic number, because the mean of its divisors is an integer number (47111221650).

Almost surely, 2^185304138431 is an apocalyptic number.

185304138431 is a deficient number, since it is larger than the sum of its proper divisors (3140748169).

185304138431 is an equidigital number, since it uses as much as digits as its factorization.

185304138431 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3140748168.

The product of its (nonzero) digits is 138240, while the sum is 41.

The spelling of 185304138431 in words is "one hundred eighty-five billion, three hundred four million, one hundred thirty-eight thousand, four hundred thirty-one".