2051556 has 24 divisors (see below), whose sum is σ = 5155584. Its totient is φ = 631200.

The previous prime is 2051537. The next prime is 2051587. The reversal of 2051556 is 6551502.

It is a super-2 number, since 2×2051556² = 8417764042272, which contains 22 as substring.

It is an unprimeable number.

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, 6420 + ... + 6731.

It is an arithmetic number, because the mean of its divisors is an integer number (214816).

2^2051556 is an apocalyptic number.

2051556 is a gapful number since it is divisible by the number (26) formed by its first and last digit.

It is an amenable number.

2051556 is an abundant number, since it is smaller than the sum of its proper divisors (3104028).

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

2051556 is a wasteful number, since it uses less digits than its factorization.

2051556 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13171 (or 13169 counting only the distinct ones).

The product of its (nonzero) digits is 1500, while the sum is 24.

The square root of 2051556 is about 1432.3253820274. The cubic root of 2051556 is about 127.0655416342.

The spelling of 2051556 in words is "two million, fifty-one thousand, five hundred fifty-six".