185640841 has 2 divisors, whose sum is σ = 185640842. Its totient is φ = 185640840.

The previous prime is 185640823. The next prime is 185640857. The reversal of 185640841 is 148046581.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 174108025 + 11532816 = 13195^2 + 3396^2 .

It is a cyclic number.

It is not a de Polignac number, because 185640841 - 2⁷ = 185640713 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 185640841.

It is not a weakly prime, because it can be changed into another prime (185640881) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 92820420 + 92820421.

It is an arithmetic number, because the mean of its divisors is an integer number (92820421).

Almost surely, 2^185640841 is an apocalyptic number.

It is an amenable number.

185640841 is a deficient number, since it is larger than the sum of its proper divisors (1).

185640841 is an equidigital number, since it uses as much as digits as its factorization.

185640841 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 30720, while the sum is 37.

The square root of 185640841 is about 13625.0079266032. The cubic root of 185640841 is about 570.4590956075.

The spelling of 185640841 in words is "one hundred eighty-five million, six hundred forty thousand, eight hundred forty-one".