11543971 has 2 divisors, whose sum is σ = 11543972. Its totient is φ = 11543970.

The previous prime is 11543957. The next prime is 11543981. The reversal of 11543971 is 17934511.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 11543971 - 2⁷ = 11543843 is a prime.

It is not a weakly prime, because it can be changed into another prime (11543911) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5771985 + 5771986.

It is an arithmetic number, because the mean of its divisors is an integer number (5771986).

Almost surely, 2^11543971 is an apocalyptic number.

11543971 is a deficient number, since it is larger than the sum of its proper divisors (1).

11543971 is an equidigital number, since it uses as much as digits as its factorization.

11543971 is an evil number, because the sum of its binary digits is even.

The product of its digits is 3780, while the sum is 31.

The square root of 11543971 is about 3397.6419764301. The cubic root of 11543971 is about 226.0051882277.

The spelling of 11543971 in words is "eleven million, five hundred forty-three thousand, nine hundred seventy-one".