185036989 has 2 divisors, whose sum is σ = 185036990. Its totient is φ = 185036988.

The previous prime is 185036981. The next prime is 185037019. The reversal of 185036989 is 989630581.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 183385764 + 1651225 = 13542^2 + 1285^2 .

It is an emirp because it is prime and its reverse (989630581) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 185036989 - 2³ = 185036981 is a prime.

It is a super-2 number, since 2×185036989² = 68477374596372242, which contains 22 as substring.

It is an alternating number because its digits alternate between odd and even.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (185036981) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 92518494 + 92518495.

It is an arithmetic number, because the mean of its divisors is an integer number (92518495).

Almost surely, 2^185036989 is an apocalyptic number.

It is an amenable number.

185036989 is a deficient number, since it is larger than the sum of its proper divisors (1).

185036989 is an equidigital number, since it uses as much as digits as its factorization.

185036989 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 466560, while the sum is 49.

The square root of 185036989 is about 13602.8301834581. The cubic root of 185036989 is about 569.8398945012.

The spelling of 185036989 in words is "one hundred eighty-five million, thirty-six thousand, nine hundred eighty-nine".