11961311 has 16 divisors (see below), whose sum is σ = 13132800. Its totient is φ = 10858848.

The previous prime is 11961289. The next prime is 11961343. The reversal of 11961311 is 11316911.

It is a cyclic number.

It is not a de Polignac number, because 11961311 - 2²² = 7767007 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (23).

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (11961211) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 52580 + ... + 52806.

It is an arithmetic number, because the mean of its divisors is an integer number (820800).

Almost surely, 2^11961311 is an apocalyptic number.

11961311 is a deficient number, since it is larger than the sum of its proper divisors (1171489).

11961311 is a wasteful number, since it uses less digits than its factorization.

11961311 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 358.

The product of its digits is 162, while the sum is 23.

The square root of 11961311 is about 3458.5128306832. The cubic root of 11961311 is about 228.6965400069.

The spelling of 11961311 in words is "eleven million, nine hundred sixty-one thousand, three hundred eleven".