2581156 has 12 divisors (see below), whose sum is σ = 4562460. Its totient is φ = 1277600.

The previous prime is 2581147. The next prime is 2581171. The reversal of 2581156 is 6511852.

It can be written as a sum of positive squares in 2 ways, for example, as 1102500 + 1478656 = 1050^2 + 1216^2 .

It is a super-3 number, since 3×2581156³ = 51589820219956333248, which contains 333 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2791 + ... + 3598.

It is an arithmetic number, because the mean of its divisors is an integer number (380205).

2^2581156 is an apocalyptic number.

It is an amenable number.

2581156 is a deficient number, since it is larger than the sum of its proper divisors (1981304).

2581156 is a wasteful number, since it uses less digits than its factorization.

2581156 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6494 (or 6492 counting only the distinct ones).

The product of its digits is 2400, while the sum is 28.

The square root of 2581156 is about 1606.5976472036. The cubic root of 2581156 is about 137.1738783579.

It can be divided in two parts, 258115 and 6, that added together give a triangular number (258121 = T₇₁₈).

The spelling of 2581156 in words is "two million, five hundred eighty-one thousand, one hundred fifty-six".