2161513551 has 8 divisors (see below), whose sum is σ = 2949041920. Its totient is φ = 1407497112.

The previous prime is 2161513547. The next prime is 2161513553. The reversal of 2161513551 is 1553151612.

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

It is not a de Polignac number, because 2161513551 - 2² = 2161513547 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 (2161513553) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 8377831 + ... + 8378088.

It is an arithmetic number, because the mean of its divisors is an integer number (368630240).

Almost surely, 2^2161513551 is an apocalyptic number.

2161513551 is a deficient number, since it is larger than the sum of its proper divisors (787528369).

2161513551 is a wasteful number, since it uses less digits than its factorization.

2161513551 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 16755965.

The product of its digits is 4500, while the sum is 30.

The square root of 2161513551 is about 46492.0805191594. The cubic root of 2161513551 is about 1292.9626737813.

The spelling of 2161513551 in words is "two billion, one hundred sixty-one million, five hundred thirteen thousand, five hundred fifty-one".