1023855681 has 8 divisors (see below), whose sum is σ = 1365401664. Its totient is φ = 682440080.

The previous prime is 1023855667. The next prime is 1023855683. The reversal of 1023855681 is 1865583201.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 1023855681 - 2⁹ = 1023855169 is a prime.

It is a super-2 number, since 2×1023855681² = 2096560911031947522, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (1023855683) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 12501 + ... + 46946.

It is an arithmetic number, because the mean of its divisors is an integer number (170675208).

Almost surely, 2^1023855681 is an apocalyptic number.

It is an amenable number.

1023855681 is a deficient number, since it is larger than the sum of its proper divisors (341545983).

1023855681 is an equidigital number, since it uses as much as digits as its factorization.

1023855681 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 65191.

The product of its (nonzero) digits is 57600, while the sum is 39.

The square root of 1023855681 is about 31997.7449361670. The cubic root of 1023855681 is about 1007.8894859865.

The spelling of 1023855681 in words is "one billion, twenty-three million, eight hundred fifty-five thousand, six hundred eighty-one".