61998217 has 8 divisors (see below), whose sum is σ = 64791936. Its totient is φ = 59266032.

The previous prime is 61998193. The next prime is 61998253. The reversal of 61998217 is 71289916.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-61998217 is a prime.

It is a super-2 number, since 2×61998217² = 7687557822358178, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (43).

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (61998017) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 13318 + ... + 17359.

It is an arithmetic number, because the mean of its divisors is an integer number (8098992).

Almost surely, 2^61998217 is an apocalyptic number.

It is an amenable number.

61998217 is a deficient number, since it is larger than the sum of its proper divisors (2793719).

61998217 is a wasteful number, since it uses less digits than its factorization.

61998217 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 30767.

The product of its digits is 54432, while the sum is 43.

The square root of 61998217 is about 7873.8946525846. The cubic root of 61998217 is about 395.7853668883.

The spelling of 61998217 in words is "sixty-one million, nine hundred ninety-eight thousand, two hundred seventeen".