1983469781 has 4 divisors (see below), whose sum is σ = 2100144492. Its totient is φ = 1866795072.

The previous prime is 1983469777. The next prime is 1983469783. The reversal of 1983469781 is 1879643891.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 1879643891 = 13903 ⋅135197.

It can be written as a sum of positive squares in 2 ways, for example, as 577969681 + 1405500100 = 24041^2 + 37490^2 .

It is a cyclic number.

It is not a de Polignac number, because 1983469781 - 2² = 1983469777 is a prime.

It is a super-2 number, since 2×1983469781² = 7868304744280375922, 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 (1983469783) 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 3 ways as a sum of consecutive naturals, for example, 58337330 + ... + 58337363.

It is an arithmetic number, because the mean of its divisors is an integer number (525036123).

Almost surely, 2^1983469781 is an apocalyptic number.

It is an amenable number.

1983469781 is a deficient number, since it is larger than the sum of its proper divisors (116674711).

1983469781 is a wasteful number, since it uses less digits than its factorization.

1983469781 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 116674710.

The product of its digits is 2612736, while the sum is 56.

The square root of 1983469781 is about 44536.1626209533. The cubic root of 1983469781 is about 1256.4403141751.

The spelling of 1983469781 in words is "one billion, nine hundred eighty-three million, four hundred sixty-nine thousand, seven hundred eighty-one".