1261156 has 24 divisors (see below), whose sum is σ = 2414720. Its totient is φ = 572832.

The previous prime is 1261133. The next prime is 1261157. The reversal of 1261156 is 6511621.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1261157) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 3955 + ... + 4261.

2^1261156 is an apocalyptic number.

It is an amenable number.

1261156 is a deficient number, since it is larger than the sum of its proper divisors (1153564).

1261156 is a wasteful number, since it uses less digits than its factorization.

1261156 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 403 (or 401 counting only the distinct ones).

The product of its digits is 360, while the sum is 22.

The square root of 1261156 is about 1123.0120213070. The cubic root of 1261156 is about 108.0412508174.

Adding to 1261156 its reverse (6511621), we get a palindrome (7772777).

The spelling of 1261156 in words is "one million, two hundred sixty-one thousand, one hundred fifty-six".