1810972881 has 12 divisors (see below), whose sum is σ = 2686548852. Its totient is φ = 1174684896.

The previous prime is 1810972871. The next prime is 1810972903. The reversal of 1810972881 is 1882790181.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 1531548225 + 279424656 = 39135^2 + 16716^2 .

It is not a de Polignac number, because 1810972881 - 2⁶ = 1810972817 is a prime.

It is a super-2 number, since 2×1810972881² = 6559245551434880322, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (1810972811) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 2718846 + ... + 2719511.

It is an arithmetic number, because the mean of its divisors is an integer number (223879071).

Almost surely, 2^1810972881 is an apocalyptic number.

It is an amenable number.

1810972881 is a deficient number, since it is larger than the sum of its proper divisors (875575971).

1810972881 is a wasteful number, since it uses less digits than its factorization.

1810972881 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5438400 (or 5438397 counting only the distinct ones).

The product of its (nonzero) digits is 64512, while the sum is 45.

The square root of 1810972881 is about 42555.5270323374. The cubic root of 1810972881 is about 1218.9072184083.

The spelling of 1810972881 in words is "one billion, eight hundred ten million, nine hundred seventy-two thousand, eight hundred eighty-one".