1261556 has 6 divisors (see below), whose sum is σ = 2207730. Its totient is φ = 630776.

The previous prime is 1261549. The next prime is 1261567. The reversal of 1261556 is 6551621.

It can be written as a sum of positive squares in only one way, i.e., 839056 + 422500 = 916^2 + 650^2 .

It is a super-2 number, since 2×1261556² = 3183047082272, which contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 157691 + ... + 157698.

It is an arithmetic number, because the mean of its divisors is an integer number (367955).

2^1261556 is an apocalyptic number.

It is an amenable number.

1261556 is a deficient number, since it is larger than the sum of its proper divisors (946174).

1261556 is a wasteful number, since it uses less digits than its factorization.

1261556 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 315393 (or 315391 counting only the distinct ones).

The product of its digits is 1800, while the sum is 26.

The square root of 1261556 is about 1123.1900996715. The cubic root of 1261556 is about 108.0526720669.

The spelling of 1261556 in words is "one million, two hundred sixty-one thousand, five hundred fifty-six".