11553971 has 16 divisors (see below), whose sum is σ = 13896960. Its totient is φ = 9465120.

The previous prime is 11553943. The next prime is 11553989. The reversal of 11553971 is 17935511.

It is a happy number.

It is a cyclic number.

It is not a de Polignac number, because 11553971 - 2¹⁴ = 11537587 is a prime.

It is not an unprimeable number, because it can be changed into a prime (11552971) 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 15 ways as a sum of consecutive naturals, for example, 5210 + ... + 7088.

It is an arithmetic number, because the mean of its divisors is an integer number (868560).

Almost surely, 2^11553971 is an apocalyptic number.

11553971 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

11553971 is a deficient number, since it is larger than the sum of its proper divisors (2342989).

11553971 is a wasteful number, since it uses less digits than its factorization.

11553971 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1946.

The product of its digits is 4725, while the sum is 32.

The square root of 11553971 is about 3399.1132667212. The cubic root of 11553971 is about 226.0704286204.

The spelling of 11553971 in words is "eleven million, five hundred fifty-three thousand, nine hundred seventy-one".