1981481469 has 16 divisors (see below), whose sum is σ = 2883042624. Its totient is φ = 1200528000.

The previous prime is 1981481449. The next prime is 1981481471. The reversal of 1981481469 is 9641841891.

It is not a de Polignac number, because 1981481469 - 2¹² = 1981477373 is a prime.

It is a super-3 number, since 3×1981481469³ (a number of 29 digits) contains 333 as substring. Note that it is a super-d number also for d = 2.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1981481449) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 131487 + ... + 145779.

It is an arithmetic number, because the mean of its divisors is an integer number (180190164).

Almost surely, 2^1981481469 is an apocalyptic number.

It is an amenable number.

1981481469 is a deficient number, since it is larger than the sum of its proper divisors (901561155).

1981481469 is a wasteful number, since it uses less digits than its factorization.

1981481469 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 18508.

The product of its digits is 497664, while the sum is 51.

The square root of 1981481469 is about 44513.8345798247. The cubic root of 1981481469 is about 1256.0203379281.

The spelling of 1981481469 in words is "one billion, nine hundred eighty-one million, four hundred eighty-one thousand, four hundred sixty-nine".