61798209 has 12 divisors (see below), whose sum is σ = 90569808. Its totient is φ = 37453240.

The previous prime is 61798201. The next prime is 61798229. The reversal of 61798209 is 90289716.

It is not a de Polignac number, because 61798209 - 2³ = 61798201 is a prime.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (61798201) 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, 84759 + ... + 85484.

It is an arithmetic number, because the mean of its divisors is an integer number (7547484).

Almost surely, 2^61798209 is an apocalyptic number.

It is an amenable number.

61798209 is a deficient number, since it is larger than the sum of its proper divisors (28771599).

61798209 is a wasteful number, since it uses less digits than its factorization.

61798209 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 170268 (or 170257 counting only the distinct ones).

The product of its (nonzero) digits is 54432, while the sum is 42.

The square root of 61798209 is about 7861.1836894961. The cubic root of 61798209 is about 395.3593034691.

The spelling of 61798209 in words is "sixty-one million, seven hundred ninety-eight thousand, two hundred nine".