61521198 has 16 divisors (see below), whose sum is σ = 130280400. Its totient is φ = 19300736.

The previous prime is 61521191. The next prime is 61521199. The reversal of 61521198 is 89112516.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (61521191) 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, 301473 + ... + 301676.

It is an arithmetic number, because the mean of its divisors is an integer number (8142525).

Almost surely, 2^61521198 is an apocalyptic number.

61521198 is an abundant number, since it is smaller than the sum of its proper divisors (68759202).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

61521198 is a wasteful number, since it uses less digits than its factorization.

61521198 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 603171.

The product of its digits is 4320, while the sum is 33.

The square root of 61521198 is about 7843.5449893527. The cubic root of 61521198 is about 394.7676847891.

The spelling of 61521198 in words is "sixty-one million, five hundred twenty-one thousand, one hundred ninety-eight".