1928608181 has 4 divisors (see below), whose sum is σ = 1942483200. Its totient is φ = 1914733164.

The previous prime is 1928608159. The next prime is 1928608207. The reversal of 1928608181 is 1818068291.

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, and also an emirpimes, since its reverse is a distinct semiprime: 1818068291 = 13 ⋅139851407.

It is a cyclic number.

It is not a de Polignac number, because 1928608181 - 2¹⁸ = 1928346037 is a prime.

It is a super-2 number, since 2×1928608181² = 7439059031640257522, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1928607181) 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, 6937301 + ... + 6937578.

It is an arithmetic number, because the mean of its divisors is an integer number (485620800).

Almost surely, 2^1928608181 is an apocalyptic number.

It is an amenable number.

1928608181 is a deficient number, since it is larger than the sum of its proper divisors (13875019).

1928608181 is a wasteful number, since it uses less digits than its factorization.

1928608181 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13875018.

The product of its (nonzero) digits is 55296, while the sum is 44.

The square root of 1928608181 is about 43915.9217254972. The cubic root of 1928608181 is about 1244.7477069244.

The spelling of 1928608181 in words is "one billion, nine hundred twenty-eight million, six hundred eight thousand, one hundred eighty-one".