1849981981 has 8 divisors (see below), whose sum is σ = 1902942720. Its totient is φ = 1797177168.

The previous prime is 1849981979. The next prime is 1849982003. The reversal of 1849981981 is 1891899481.

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 1849981981 - 2¹ = 1849981979 is a prime.

It is a super-2 number, since 2×1849981981² = 6844866660049368722, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1849981481) 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, 14701 + ... + 62578.

It is an arithmetic number, because the mean of its divisors is an integer number (237867840).

Almost surely, 2^1849981981 is an apocalyptic number.

It is an amenable number.

1849981981 is a deficient number, since it is larger than the sum of its proper divisors (52960739).

1849981981 is an equidigital number, since it uses as much as digits as its factorization.

1849981981 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 77963.

The product of its digits is 1492992, while the sum is 58.

The square root of 1849981981 is about 43011.4168680828. The cubic root of 1849981981 is about 1227.5970405679.

The spelling of 1849981981 in words is "one billion, eight hundred forty-nine million, nine hundred eighty-one thousand, nine hundred eighty-one".