2159553842 has 8 divisors (see below), whose sum is σ = 3292434732. Its totient is φ = 1062075600.

The previous prime is 2159553839. The next prime is 2159553871. The reversal of 2159553842 is 2483559512.

It is a Cunningham number, because it is equal to 46471²+1.

It can be written as a sum of positive squares in 2 ways, for example, as 2159553841 + 1 = 46471^2 + 1^2 .

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

It is a junction number, because it is equal to n+sod(n) for n = 2159553793 and 2159553802.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 8850509 + ... + 8850752.

Almost surely, 2^2159553842 is an apocalyptic number.

2159553842 is a deficient number, since it is larger than the sum of its proper divisors (1132880890).

2159553842 is a wasteful number, since it uses less digits than its factorization.

2159553842 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 17701324.

The product of its digits is 432000, while the sum is 44.

The square root of 2159553842 is about 46471.0000107594. Note that the first 4 decimals coincide. The cubic root of 2159553842 is about 1292.5718061986.

The spelling of 2159553842 in words is "two billion, one hundred fifty-nine million, five hundred fifty-three thousand, eight hundred forty-two".