61634221 has 4 divisors (see below), whose sum is σ = 67237344. Its totient is φ = 56031100.

The previous prime is 61634213. The next prime is 61634239. The reversal of 61634221 is 12243616.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 61634221 - 2³ = 61634213 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (61634201) 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, 2801545 + ... + 2801566.

It is an arithmetic number, because the mean of its divisors is an integer number (16809336).

Almost surely, 2^61634221 is an apocalyptic number.

It is an amenable number.

61634221 is a deficient number, since it is larger than the sum of its proper divisors (5603123).

61634221 is a wasteful number, since it uses less digits than its factorization.

61634221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5603122.

The product of its digits is 1728, while the sum is 25.

The square root of 61634221 is about 7850.7465250128. The cubic root of 61634221 is about 395.0092846186.

Adding to 61634221 its reverse (12243616), we get a palindrome (73877837).

The spelling of 61634221 in words is "sixty-one million, six hundred thirty-four thousand, two hundred twenty-one".