1681228893 has 4 divisors (see below), whose sum is σ = 2241638528. Its totient is φ = 1120819260.

The previous prime is 1681228883. The next prime is 1681228949. The reversal of 1681228893 is 3988221861.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is not a de Polignac number, because 1681228893 - 2²⁵ = 1647674461 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1681228823) 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, 280204813 + ... + 280204818.

It is an arithmetic number, because the mean of its divisors is an integer number (560409632).

Almost surely, 2^1681228893 is an apocalyptic number.

It is an amenable number.

1681228893 is a deficient number, since it is larger than the sum of its proper divisors (560409635).

1681228893 is an equidigital number, since it uses as much as digits as its factorization.

1681228893 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 560409634.

The product of its digits is 331776, while the sum is 48.

The square root of 1681228893 is about 41002.7912830334. The cubic root of 1681228893 is about 1189.0741787977.

The spelling of 1681228893 in words is "one billion, six hundred eighty-one million, two hundred twenty-eight thousand, eight hundred ninety-three".