61798221 has 20 divisors (see below), whose sum is σ = 95297664. Its totient is φ = 39868200.

The previous prime is 61798201. The next prime is 61798229. The reversal of 61798221 is 12289716.

It is not a de Polignac number, because 61798221 - 2⁵ = 61798189 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (61798229) by changing a digit.

It is a polite number, since it can be written in 19 ways as a sum of consecutive naturals, for example, 9795 + ... + 14816.

Almost surely, 2^61798221 is an apocalyptic number.

It is an amenable number.

61798221 is a deficient number, since it is larger than the sum of its proper divisors (33499443).

61798221 is a wasteful number, since it uses less digits than its factorization.

61798221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 24654 (or 24645 counting only the distinct ones).

The product of its digits is 12096, while the sum is 36.

The square root of 61798221 is about 7861.1844527399. The cubic root of 61798221 is about 395.3593290595.

It can be divided in two parts, 6179 and 8221, that added together give a square (14400 = 120²).

The spelling of 61798221 in words is "sixty-one million, seven hundred ninety-eight thousand, two hundred twenty-one".