61711216 has 20 divisors (see below), whose sum is σ = 136646512. Its totient is φ = 26447616.

The previous prime is 61711213. The next prime is 61711219. The reversal of 61711216 is 61211716.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (61711213) and next prime (61711219).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (61711211) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 275385 + ... + 275608.

Almost surely, 2^61711216 is an apocalyptic number.

It is an amenable number.

61711216 is an abundant number, since it is smaller than the sum of its proper divisors (74935296).

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

61711216 is a wasteful number, since it uses less digits than its factorization.

61711216 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 551008 (or 551002 counting only the distinct ones).

The product of its digits is 504, while the sum is 25.

The square root of 61711216 is about 7855.6486683150. The cubic root of 61711216 is about 395.1737013102.

Subtracting from 61711216 its reverse (61211716), we obtain a triangular number (499500 = T₉₉₉).

The spelling of 61711216 in words is "sixty-one million, seven hundred eleven thousand, two hundred sixteen".