2161537333 has 4 divisors (see below), whose sum is σ = 2178557440. Its totient is φ = 2144517228.

The previous prime is 2161537331. The next prime is 2161537381. The reversal of 2161537333 is 3337351612.

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 a cyclic number.

It is not a de Polignac number, because 2161537333 - 2¹ = 2161537331 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 (2161537331) 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, 8509863 + ... + 8510116.

It is an arithmetic number, because the mean of its divisors is an integer number (544639360).

Almost surely, 2^2161537333 is an apocalyptic number.

It is an amenable number.

2161537333 is a deficient number, since it is larger than the sum of its proper divisors (17020107).

2161537333 is a wasteful number, since it uses less digits than its factorization.

2161537333 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 17020106.

The product of its digits is 34020, while the sum is 34.

The square root of 2161537333 is about 46492.3362824455. The cubic root of 2161537333 is about 1292.9674156940.

Adding to 2161537333 its reverse (3337351612), we get a palindrome (5498888945).

The spelling of 2161537333 in words is "two billion, one hundred sixty-one million, five hundred thirty-seven thousand, three hundred thirty-three".