1894536081 has 8 divisors (see below), whose sum is σ = 2806720160. Its totient is φ = 1263024036.

The previous prime is 1894536073. The next prime is 1894536101. The reversal of 1894536081 is 1806354981.

It is not a de Polignac number, because 1894536081 - 2³ = 1894536073 is a prime.

It is a super-2 number, since 2×1894536081² = 7178533924421677122, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1894536181) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 35083975 + ... + 35084028.

It is an arithmetic number, because the mean of its divisors is an integer number (350840020).

Almost surely, 2^1894536081 is an apocalyptic number.

It is an amenable number.

1894536081 is a deficient number, since it is larger than the sum of its proper divisors (912184079).

1894536081 is an equidigital number, since it uses as much as digits as its factorization.

1894536081 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 70168012 (or 70168006 counting only the distinct ones).

The product of its (nonzero) digits is 207360, while the sum is 45.

The square root of 1894536081 is about 43526.2688614588. The cubic root of 1894536081 is about 1237.3739258156.

The spelling of 1894536081 in words is "one billion, eight hundred ninety-four million, five hundred thirty-six thousand, eighty-one".