2521556 has 12 divisors (see below), whose sum is σ = 4425792. Its totient is φ = 1257048.

The previous prime is 2521537. The next prime is 2521591. The reversal of 2521556 is 6551252.

It is a super-2 number, since 2×2521556² = 12716489322272, which contains 22 as substring.

It is an Ulam number.

It is a congruent number.

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, 1061 + ... + 2483.

It is an arithmetic number, because the mean of its divisors is an integer number (368816).

2^2521556 is an apocalyptic number.

It is an amenable number.

2521556 is a deficient number, since it is larger than the sum of its proper divisors (1904236).

2521556 is a wasteful number, since it uses less digits than its factorization.

2521556 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1870 (or 1868 counting only the distinct ones).

The product of its digits is 3000, while the sum is 26.

The square root of 2521556 is about 1587.9408049420. The cubic root of 2521556 is about 136.1098449355.

It can be divided in two parts, 252155 and 6, that multiplied together give a triangular number (1512930 = T₁₇₃₉).

The spelling of 2521556 in words is "two million, five hundred twenty-one thousand, five hundred fifty-six".