185553149 has 2 divisors, whose sum is σ = 185553150. Its totient is φ = 185553148.

The previous prime is 185553139. The next prime is 185553157. The reversal of 185553149 is 941355581.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 175377049 + 10176100 = 13243^2 + 3190^2 .

It is a cyclic number.

It is not a de Polignac number, because 185553149 - 2¹² = 185549053 is a prime.

It is a super-2 number, since 2×185553149² = 68859942207632402, which contains 22 as substring.

It is a Sophie Germain prime.

It is a Curzon number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (185553139) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 92776574 + 92776575.

It is an arithmetic number, because the mean of its divisors is an integer number (92776575).

Almost surely, 2^185553149 is an apocalyptic number.

It is an amenable number.

185553149 is a deficient number, since it is larger than the sum of its proper divisors (1).

185553149 is an equidigital number, since it uses as much as digits as its factorization.

185553149 is an evil number, because the sum of its binary digits is even.

The product of its digits is 108000, while the sum is 41.

The square root of 185553149 is about 13621.7894933081. The cubic root of 185553149 is about 570.3692580164.

The spelling of 185553149 in words is "one hundred eighty-five million, five hundred fifty-three thousand, one hundred forty-nine".