2051616 has 96 divisors (see below), whose sum is σ = 6386688. Its totient is φ = 564480.

The previous prime is 2051593. The next prime is 2051617. The reversal of 2051616 is 6161502.

It is a happy number.

It is a tau number, because it is divible by the number of its divisors (96).

It is a super-2 number, since 2×2051616² = 8418256422912, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (21).

It is an Ulam number.

It is a junction number, because it is equal to n+sod(n) for n = 2051592 and 2051601.

It is not an unprimeable number, because it can be changed into a prime (2051617) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 28861 + ... + 28931.

It is an arithmetic number, because the mean of its divisors is an integer number (66528).

2^2051616 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 2051616, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (3193344).

2051616 is an abundant number, since it is smaller than the sum of its proper divisors (4335072).

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

2051616 is a wasteful number, since it uses less digits than its factorization.

2051616 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 134 (or 126 counting only the distinct ones).

The product of its (nonzero) digits is 360, while the sum is 21.

The square root of 2051616 is about 1432.3463268358. The cubic root of 2051616 is about 127.0667803457.

The spelling of 2051616 in words is "two million, fifty-one thousand, six hundred sixteen".