181364865 has 16 divisors (see below), whose sum is σ = 316564416. Its totient is φ = 87934400.

The previous prime is 181364851. The next prime is 181364881. The reversal of 181364865 is 568463181.

It is not a de Polignac number, because 181364865 - 2¹³ = 181356673 is a prime.

It is an unprimeable number.

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 15 ways as a sum of consecutive naturals, for example, 549426 + ... + 549755.

It is an arithmetic number, because the mean of its divisors is an integer number (19785276).

Almost surely, 2^181364865 is an apocalyptic number.

181364865 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

181364865 is a deficient number, since it is larger than the sum of its proper divisors (135199551).

181364865 is a wasteful number, since it uses less digits than its factorization.

181364865 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1099200.

The product of its digits is 138240, while the sum is 42.

The square root of 181364865 is about 13467.1773211761. The cubic root of 181364865 is about 566.0451222419.

The spelling of 181364865 in words is "one hundred eighty-one million, three hundred sixty-four thousand, eight hundred sixty-five".