1946987081 has 8 divisors (see below), whose sum is σ = 2131129224. Its totient is φ = 1767755520.

The previous prime is 1946987071. The next prime is 1946987129. The reversal of 1946987081 is 1807896491.

It can be written as a sum of positive squares in 4 ways, for example, as 77721856 + 1869265225 = 8816^2 + 43235^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 1946987081 - 2⁶ = 1946987017 is a prime.

It is a super-2 number, since 2×1946987081² = 7581517387161801122, which contains 22 as substring.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (1946987041) by changing a digit.

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 7 ways as a sum of consecutive naturals, for example, 1226816 + ... + 1228401.

It is an arithmetic number, because the mean of its divisors is an integer number (266391153).

Almost surely, 2^1946987081 is an apocalyptic number.

It is an amenable number.

1946987081 is a deficient number, since it is larger than the sum of its proper divisors (184142143).

1946987081 is a wasteful number, since it uses less digits than its factorization.

1946987081 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2455291.

The product of its (nonzero) digits is 870912, while the sum is 53.

The square root of 1946987081 is about 44124.6765540553. The cubic root of 1946987081 is about 1248.6892032099.

The spelling of 1946987081 in words is "one billion, nine hundred forty-six million, nine hundred eighty-seven thousand, eighty-one".