2891216 has 10 divisors (see below), whose sum is σ = 5601762. Its totient is φ = 1445600.

The previous prime is 2891201. The next prime is 2891219. The reversal of 2891216 is 6121982.

It can be written as a sum of positive squares in only one way, i.e., 1690000 + 1201216 = 1300^2 + 1096^2 .

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2891219) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 90335 + ... + 90366.

2^2891216 is an apocalyptic number.

It is an amenable number.

2891216 is a deficient number, since it is larger than the sum of its proper divisors (2710546).

2891216 is a wasteful number, since it uses less digits than its factorization.

2891216 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 180709 (or 180703 counting only the distinct ones).

The product of its digits is 1728, while the sum is 29.

The square root of 2891216 is about 1700.3576094457. The cubic root of 2891216 is about 142.4601879138.

The spelling of 2891216 in words is "two million, eight hundred ninety-one thousand, two hundred sixteen".