2151000 has 96 divisors (see below), whose sum is σ = 7300800. Its totient is φ = 571200.

The previous prime is 2150977. The next prime is 2151001. The reversal of 2151000 is 1512.

It is a happy number.

It is a Harshad number since it is a multiple of its sum of digits (9).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2151001) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 8881 + ... + 9119.

It is an arithmetic number, because the mean of its divisors is an integer number (76050).

2^2151000 is an apocalyptic number.

2151000 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 2151000, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (3650400).

2151000 is an abundant number, since it is smaller than the sum of its proper divisors (5149800).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

2151000 is a wasteful number, since it uses less digits than its factorization.

2151000 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 266 (or 249 counting only the distinct ones).

The product of its (nonzero) digits is 10, while the sum is 9.

The square root of 2151000 is about 1466.6287873896. The cubic root of 2151000 is about 129.0862952431.

Adding to 2151000 its reverse (1512), we get a palindrome (2152512).

The spelling of 2151000 in words is "two million, one hundred fifty-one thousand".