61211216 has 40 divisors (see below), whose sum is σ = 129929184. Its totient is φ = 27704960.

The previous prime is 61211207. The next prime is 61211221.

61211216 is nontrivially palindromic in base 10.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 50975 + ... + 52161.

Almost surely, 2^61211216 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 61211216, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (64964592).

61211216 is an abundant number, since it is smaller than the sum of its proper divisors (68717968).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

61211216 is a wasteful number, since it uses less digits than its factorization.

61211216 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1499 (or 1493 counting only the distinct ones).

The product of its digits is 144, while the sum is 20.

The square root of 61211216 is about 7823.7597100115. The cubic root of 61211216 is about 394.1035398302.

It can be divided in two parts, 6121 and 1216, that added together give a palindrome (7337).

The spelling of 61211216 in words is "sixty-one million, two hundred eleven thousand, two hundred sixteen".