783800081 has 4 divisors (see below), whose sum is σ = 810827700. Its totient is φ = 756772464.

The previous prime is 783800053. The next prime is 783800089. The reversal of 783800081 is 180008387.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 180008387 = 13 ⋅13846799.

It can be written as a sum of positive squares in 2 ways, for example, as 384160000 + 399640081 = 19600^2 + 19991^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-783800081 is a prime.

It is a super-2 number, since 2×783800081² = 1228685133951213122, 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 (783800089) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 13513766 + ... + 13513823.

It is an arithmetic number, because the mean of its divisors is an integer number (202706925).

Almost surely, 2^783800081 is an apocalyptic number.

It is an amenable number.

783800081 is a deficient number, since it is larger than the sum of its proper divisors (27027619).

783800081 is a wasteful number, since it uses less digits than its factorization.

783800081 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 27027618.

The product of its (nonzero) digits is 10752, while the sum is 35.

The square root of 783800081 is about 27996.4297902429. The cubic root of 783800081 is about 922.0088747238.

The spelling of 783800081 in words is "seven hundred eighty-three million, eight hundred thousand, eighty-one".