185239141081409 has 2 divisors, whose sum is σ = 185239141081410. Its totient is φ = 185239141081408.

The previous prime is 185239141081367. The next prime is 185239141081447. The reversal of 185239141081409 is 904180141932581.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 180565653750784 + 4673487330625 = 13437472^2 + 2161825^2 .

It is a cyclic number.

It is not a de Polignac number, because 185239141081409 - 2³² = 185234846114113 is a prime.

It is not a weakly prime, because it can be changed into another prime (185239141081459) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 92619570540704 + 92619570540705.

It is an arithmetic number, because the mean of its divisors is an integer number (92619570540705).

Almost surely, 2^{185239141081409} is an apocalyptic number.

It is an amenable number.

185239141081409 is a deficient number, since it is larger than the sum of its proper divisors (1).

185239141081409 is an equidigital number, since it uses as much as digits as its factorization.

185239141081409 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 2488320, while the sum is 56.

The spelling of 185239141081409 in words is "one hundred eighty-five trillion, two hundred thirty-nine billion, one hundred forty-one million, eighty-one thousand, four hundred nine".