185136961 has 4 divisors (see below), whose sum is σ = 185314500. Its totient is φ = 184959424.

The previous prime is 185136949. The next prime is 185136967. The reversal of 185136961 is 169631581.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 113209600 + 71927361 = 10640^2 + 8481^2 .

It is a cyclic number.

It is not a de Polignac number, because 185136961 - 2⁹ = 185136449 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (185136967) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 87196 + ... + 89293.

It is an arithmetic number, because the mean of its divisors is an integer number (46328625).

Almost surely, 2^185136961 is an apocalyptic number.

It is an amenable number.

185136961 is a deficient number, since it is larger than the sum of its proper divisors (177539).

185136961 is a wasteful number, since it uses less digits than its factorization.

185136961 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 177538.

The product of its digits is 38880, while the sum is 40.

The square root of 185136961 is about 13606.5043637225. The cubic root of 185136961 is about 569.9425006121.

The spelling of 185136961 in words is "one hundred eighty-five million, one hundred thirty-six thousand, nine hundred sixty-one".