2151800155 has 8 divisors (see below), whose sum is σ = 2594399184. Its totient is φ = 1713280800.

The previous prime is 2151800153. The next prime is 2151800173. The reversal of 2151800155 is 5510081512.

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

It is not a de Polignac number, because 2151800155 - 2¹ = 2151800153 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (2151800153) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1018756 + ... + 1020865.

It is an arithmetic number, because the mean of its divisors is an integer number (324299898).

Almost surely, 2^2151800155 is an apocalyptic number.

2151800155 is a deficient number, since it is larger than the sum of its proper divisors (442599029).

2151800155 is a wasteful number, since it uses less digits than its factorization.

2151800155 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2039837.

The product of its (nonzero) digits is 2000, while the sum is 28.

The square root of 2151800155 is about 46387.4999865265. The cubic root of 2151800155 is about 1291.0229961926.

Adding to 2151800155 its reverse (5510081512), we get a palindrome (7661881667).

The spelling of 2151800155 in words is "two billion, one hundred fifty-one million, eight hundred thousand, one hundred fifty-five".