1681219161 has 24 divisors (see below), whose sum is σ = 2579720000. Its totient is φ = 1052069472.

The previous prime is 1681219151. The next prime is 1681219171. The reversal of 1681219161 is 1619121861.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (1681219151) and next prime (1681219171).

It is not a de Polignac number, because 1681219161 - 2¹¹ = 1681217113 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (1681219121) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 26461 + ... + 63738.

Almost surely, 2^1681219161 is an apocalyptic number.

It is an amenable number.

1681219161 is a deficient number, since it is larger than the sum of its proper divisors (898500839).

1681219161 is a wasteful number, since it uses less digits than its factorization.

1681219161 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 90333 (or 90330 counting only the distinct ones).

The product of its digits is 5184, while the sum is 36.

The square root of 1681219161 is about 41002.6726080142. The cubic root of 1681219161 is about 1189.0718844260.

The spelling of 1681219161 in words is "one billion, six hundred eighty-one million, two hundred nineteen thousand, one hundred sixty-one".