2556145 has 16 divisors (see below), whose sum is σ = 3236688. Its totient is φ = 1935360.

The previous prime is 2556143. The next prime is 2556149. The reversal of 2556145 is 5416552.

It can be written as a sum of positive squares in 8 ways, for example, as 150544 + 2405601 = 388^2 + 1551^2 .

It is not a de Polignac number, because 2556145 - 2¹ = 2556143 is a prime.

It is a super-2 number, since 2×2556145² = 13067754522050, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (2556143) 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, 7417 + ... + 7753.

It is an arithmetic number, because the mean of its divisors is an integer number (202293).

2^2556145 is an apocalyptic number.

It is an amenable number.

2556145 is a deficient number, since it is larger than the sum of its proper divisors (680543).

2556145 is a wasteful number, since it uses less digits than its factorization.

2556145 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 420.

The product of its digits is 6000, while the sum is 28.

The square root of 2556145 is about 1598.7948586357. The cubic root of 2556145 is about 136.7293750164.

It can be divided in two parts, 2556 and 145, that added together give a triangular number (2701 = T₇₃).

The spelling of 2556145 in words is "two million, five hundred fifty-six thousand, one hundred forty-five".