11736981 has 20 divisors (see below), whose sum is σ = 17911872. Its totient is φ = 7655688.

The previous prime is 11736973. The next prime is 11736983. The reversal of 11736981 is 18963711.

It is not a de Polignac number, because 11736981 - 2³ = 11736973 is a prime.

It is a super-2 number, since 2×11736981² = 275513445988722, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (11736983) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 19 ways as a sum of consecutive naturals, for example, 2266 + ... + 5348.

Almost surely, 2^11736981 is an apocalyptic number.

It is an amenable number.

11736981 is a deficient number, since it is larger than the sum of its proper divisors (6174891).

11736981 is an equidigital number, since it uses as much as digits as its factorization.

11736981 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3142 (or 3133 counting only the distinct ones).

The product of its digits is 9072, while the sum is 36.

The square root of 11736981 is about 3425.9277575571. The cubic root of 11736981 is about 227.2578012549.

The spelling of 11736981 in words is "eleven million, seven hundred thirty-six thousand, nine hundred eighty-one".