185144013 has 6 divisors (see below), whose sum is σ = 267430254. Its totient is φ = 123429336.

The previous prime is 185143993. The next prime is 185144023. The reversal of 185144013 is 310441581.

It is a happy number.

It can be written as a sum of positive squares in only one way, i.e., 176305284 + 8838729 = 13278^2 + 2973^2 .

It is not a de Polignac number, because 185144013 - 2⁸ = 185143757 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (185144023) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 10285770 + ... + 10285787.

It is an arithmetic number, because the mean of its divisors is an integer number (44571709).

Almost surely, 2^185144013 is an apocalyptic number.

It is an amenable number.

185144013 is a deficient number, since it is larger than the sum of its proper divisors (82286241).

185144013 is a wasteful number, since it uses less digits than its factorization.

185144013 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 20571563 (or 20571560 counting only the distinct ones).

The product of its (nonzero) digits is 1920, while the sum is 27.

The square root of 185144013 is about 13606.7635020235. The cubic root of 185144013 is about 569.9497370268.

Adding to 185144013 its reverse (310441581), we get a palindrome (495585594).

The spelling of 185144013 in words is "one hundred eighty-five million, one hundred forty-four thousand, thirteen".