61772121 has 12 divisors (see below), whose sum is σ = 89796772. Its totient is φ = 40918176.

The previous prime is 61772111. The next prime is 61772143. The reversal of 61772121 is 12127716.

61772121 is a `hidden beast` number, since 617 + 7 + 21 + 21 = 666.

It can be written as a sum of positive squares in 2 ways, for example, as 46090521 + 15681600 = 6789^2 + 3960^2 .

It is not a de Polignac number, because 61772121 - 2¹⁰ = 61771097 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (61772111) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 20446 + ... + 23271.

Almost surely, 2^61772121 is an apocalyptic number.

It is an amenable number.

61772121 is a deficient number, since it is larger than the sum of its proper divisors (28024651).

61772121 is a wasteful number, since it uses less digits than its factorization.

61772121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 43880 (or 43877 counting only the distinct ones).

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

The square root of 61772121 is about 7859.5242222414. The cubic root of 61772121 is about 395.3036622384.

Adding to 61772121 its reverse (12127716), we get a palindrome (73899837).

The spelling of 61772121 in words is "sixty-one million, seven hundred seventy-two thousand, one hundred twenty-one".