61771212 has 18 divisors (see below), whose sum is σ = 156143988. Its totient is φ = 20590392.

The previous prime is 61771211. The next prime is 61771267. The reversal of 61771212 is 21217716.

It is a tau number, because it is divible by the number of its divisors (18).

It is not an unprimeable number, because it can be changed into a prime (61771211) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 857898 + ... + 857969.

It is an arithmetic number, because the mean of its divisors is an integer number (8674666).

Almost surely, 2^61771212 is an apocalyptic number.

It is an amenable number.

61771212 is an abundant number, since it is smaller than the sum of its proper divisors (94372776).

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

61771212 is a wasteful number, since it uses less digits than its factorization.

61771212 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1715877 (or 1715872 counting only the distinct ones).

The product of its digits is 1176, while the sum is 27.

The square root of 61771212 is about 7859.4663941008. The cubic root of 61771212 is about 395.3017232149.

Adding to 61771212 its reverse (21217716), we get a palindrome (82988928).

The spelling of 61771212 in words is "sixty-one million, seven hundred seventy-one thousand, two hundred twelve".