11891216 has 20 divisors (see below), whose sum is σ = 23246652. Its totient is φ = 5892096.

The previous prime is 11891203. The next prime is 11891251. The reversal of 11891216 is 61219811.

It can be written as a sum of positive squares in 2 ways, for example, as 6150400 + 5740816 = 2480^2 + 2396^2 .

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1481 + ... + 5096.

Almost surely, 2^11891216 is an apocalyptic number.

11891216 is a gapful number since it is divisible by the number (16) formed by its first and last digit.

It is an amenable number.

11891216 is a deficient number, since it is larger than the sum of its proper divisors (11355436).

11891216 is a wasteful number, since it uses less digits than its factorization.

11891216 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6698 (or 6692 counting only the distinct ones).

The product of its digits is 864, while the sum is 29.

The square root of 11891216 is about 3448.3642499017. The cubic root of 11891216 is about 228.2489329968.

The spelling of 11891216 in words is "eleven million, eight hundred ninety-one thousand, two hundred sixteen".