11971523 has 8 divisors (see below), whose sum is σ = 12669696. Its totient is φ = 11288200.

The previous prime is 11971517. The next prime is 11971529. The reversal of 11971523 is 32517911.

It is an interprime number because it is at equal distance from previous prime (11971517) and next prime (11971529).

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 11971523 - 2¹² = 11967427 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (11971529) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2033 + ... + 5298.

It is an arithmetic number, because the mean of its divisors is an integer number (1583712).

Almost surely, 2^11971523 is an apocalyptic number.

11971523 is a deficient number, since it is larger than the sum of its proper divisors (698173).

11971523 is an equidigital number, since it uses as much as digits as its factorization.

11971523 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7425.

The product of its digits is 1890, while the sum is 29.

The square root of 11971523 is about 3459.9888728145. The cubic root of 11971523 is about 228.7616049136.

The spelling of 11971523 in words is "eleven million, nine hundred seventy-one thousand, five hundred twenty-three".