11961533 has 4 divisors (see below), whose sum is σ = 11984928. Its totient is φ = 11938140.

The previous prime is 11961527. The next prime is 11961563. The reversal of 11961533 is 33516911.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 11961533 - 2¹⁶ = 11895997 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 11961496 and 11961505.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (11961563) 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, 10913 + ... + 11958.

It is an arithmetic number, because the mean of its divisors is an integer number (2996232).

Almost surely, 2^11961533 is an apocalyptic number.

It is an amenable number.

11961533 is a deficient number, since it is larger than the sum of its proper divisors (23395).

11961533 is an equidigital number, since it uses as much as digits as its factorization.

11961533 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 23394.

The product of its digits is 2430, while the sum is 29.

The square root of 11961533 is about 3458.5449252540. The cubic root of 11961533 is about 228.6979548551.

The spelling of 11961533 in words is "eleven million, nine hundred sixty-one thousand, five hundred thirty-three".