1191156 has 24 divisors (see below), whose sum is σ = 2943360. Its totient is φ = 373632.

The previous prime is 1191149. The next prime is 1191163. The reversal of 1191156 is 6511911.

It is an interprime number because it is at equal distance from previous prime (1191149) and next prime (1191163).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2716 + ... + 3123.

It is an arithmetic number, because the mean of its divisors is an integer number (122640).

2^1191156 is an apocalyptic number.

It is an amenable number.

1191156 is an abundant number, since it is smaller than the sum of its proper divisors (1752204).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

1191156 is a wasteful number, since it uses less digits than its factorization.

1191156 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5863 (or 5861 counting only the distinct ones).

The product of its digits is 270, while the sum is 24.

The square root of 1191156 is about 1091.4009345790. The cubic root of 1191156 is about 106.0041531540.

It can be divided in two parts, 119 and 1156, that added together give a triangular number (1275 = T₅₀).

The spelling of 1191156 in words is "one million, one hundred ninety-one thousand, one hundred fifty-six".