1251556 has 12 divisors (see below), whose sum is σ = 2206960. Its totient is φ = 621000.

The previous prime is 1251533. The next prime is 1251571. The reversal of 1251556 is 6551521.

It is a super-2 number, since 2×1251556² = 3132784842272, which contains 22 as substring.

It is a hoax number, since the sum of its digits (25) coincides with the sum of the digits of its distinct prime factors.

It is a self number, because there is not a number n which added to its sum of digits gives 1251556.

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, 570 + ... + 1681.

2^1251556 is an apocalyptic number.

It is an amenable number.

1251556 is a deficient number, since it is larger than the sum of its proper divisors (955404).

1251556 is a wasteful number, since it uses less digits than its factorization.

1251556 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2394 (or 2392 counting only the distinct ones).

The product of its digits is 1500, while the sum is 25.

The square root of 1251556 is about 1118.7296366862. The cubic root of 1251556 is about 107.7664133064.

It can be divided in two parts, 1251 and 556, that multiplied together give a square (695556 = 834²).

The spelling of 1251556 in words is "one million, two hundred fifty-one thousand, five hundred fifty-six".