2151800156 has 24 divisors (see below), whose sum is σ = 4109310576. Its totient is φ = 977774720.

The previous prime is 2151800153. The next prime is 2151800173. The reversal of 2151800156 is 6510081512.

It is a super-2 number, since 2×2151800156² = 9260487822723248672, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2151800153) 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, 179750 + ... + 191346.

It is an arithmetic number, because the mean of its divisors is an integer number (171221274).

Almost surely, 2^2151800156 is an apocalyptic number.

It is a pronic number, being equal to 46387×46388.

It is an amenable number.

2151800156 is a deficient number, since it is larger than the sum of its proper divisors (1957510420).

2151800156 is a wasteful number, since it uses less digits than its factorization.

2151800156 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 15829 (or 15827 counting only the distinct ones).

The product of its (nonzero) digits is 2400, while the sum is 29.

The square root of 2151800156 is about 46387.4999973053. The cubic root of 2151800156 is about 1291.0229963926.

Adding to 2151800156 its reverse (6510081512), we get a palindrome (8661881668).

The spelling of 2151800156 in words is "two billion, one hundred fifty-one million, eight hundred thousand, one hundred fifty-six".