11901523 has 4 divisors (see below), whose sum is σ = 11911168. Its totient is φ = 11891880.

The previous prime is 11901509. The next prime is 11901529. The reversal of 11901523 is 32510911.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length, and also an emirpimes, since its reverse is a distinct semiprime: 32510911 = 653 ⋅49787.

It is a cyclic number.

It is not a de Polignac number, because 11901523 - 2¹³ = 11893331 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 11901494 and 11901503.

It is not an unprimeable number, because it can be changed into a prime (11901529) 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 3 ways as a sum of consecutive naturals, for example, 2643 + ... + 5548.

It is an arithmetic number, because the mean of its divisors is an integer number (2977792).

Almost surely, 2^11901523 is an apocalyptic number.

11901523 is a deficient number, since it is larger than the sum of its proper divisors (9645).

11901523 is an equidigital number, since it uses as much as digits as its factorization.

11901523 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9644.

The product of its (nonzero) digits is 270, while the sum is 22.

The square root of 11901523 is about 3449.8584028913. The cubic root of 11901523 is about 228.3148607193.

The spelling of 11901523 in words is "eleven million, nine hundred one thousand, five hundred twenty-three".