1840763081 has 4 divisors (see below), whose sum is σ = 1904237700. Its totient is φ = 1777288464.

The previous prime is 1840763063. The next prime is 1840763129. The reversal of 1840763081 is 1803670481.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 1803670481 = 857 ⋅2104633.

It can be written as a sum of positive squares in 2 ways, for example, as 636048400 + 1204714681 = 25220^2 + 34709^2 .

It is a cyclic number.

It is not a de Polignac number, because 1840763081 - 2¹⁴ = 1840746697 is a prime.

It is a super-2 number, since 2×1840763081² = 6776817440745225122, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1840763381) 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, 31737266 + ... + 31737323.

It is an arithmetic number, because the mean of its divisors is an integer number (476059425).

Almost surely, 2^1840763081 is an apocalyptic number.

It is an amenable number.

1840763081 is a deficient number, since it is larger than the sum of its proper divisors (63474619).

1840763081 is an equidigital number, since it uses as much as digits as its factorization.

1840763081 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 63474618.

The product of its (nonzero) digits is 32256, while the sum is 38.

The square root of 1840763081 is about 42904.1149658165. The cubic root of 1840763081 is about 1225.5545080313.

The spelling of 1840763081 in words is "one billion, eight hundred forty million, seven hundred sixty-three thousand, eighty-one".