11971156 has 6 divisors (see below), whose sum is σ = 20949530. Its totient is φ = 5985576.

The previous prime is 11971117. The next prime is 11971199. The reversal of 11971156 is 65117911.

11971156 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in only one way, i.e., 10368400 + 1602756 = 3220^2 + 1266^2 .

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, 1496391 + ... + 1496398.

Almost surely, 2^11971156 is an apocalyptic number.

It is an amenable number.

11971156 is a deficient number, since it is larger than the sum of its proper divisors (8978374).

11971156 is a wasteful number, since it uses less digits than its factorization.

11971156 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2992793 (or 2992791 counting only the distinct ones).

The product of its digits is 1890, while the sum is 31.

The square root of 11971156 is about 3459.9358375554. The cubic root of 11971156 is about 228.7592672448.

The spelling of 11971156 in words is "eleven million, nine hundred seventy-one thousand, one hundred fifty-six".