1865042681 has 4 divisors (see below), whose sum is σ = 1974751092. Its totient is φ = 1755334272.

The previous prime is 1865042659. The next prime is 1865042701. The reversal of 1865042681 is 1862405681.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 1204090000 + 660952681 = 34700^2 + 25709^2 .

It is a cyclic number.

It is not a de Polignac number, because 1865042681 - 2¹⁸ = 1864780537 is a prime.

It is a super-2 number, since 2×1865042681² = 6956768403903335522, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1865042651) 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, 54854180 + ... + 54854213.

It is an arithmetic number, because the mean of its divisors is an integer number (493687773).

Almost surely, 2^1865042681 is an apocalyptic number.

It is an amenable number.

1865042681 is a deficient number, since it is larger than the sum of its proper divisors (109708411).

1865042681 is a wasteful number, since it uses less digits than its factorization.

1865042681 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 109708410.

The product of its (nonzero) digits is 92160, while the sum is 41.

The square root of 1865042681 is about 43186.1399178023. The cubic root of 1865042681 is about 1230.9193296663.

The spelling of 1865042681 in words is "one billion, eight hundred sixty-five million, forty-two thousand, six hundred eighty-one".